Array ( [0] => {{short description|Interdisciplinary scientific study of the atmosphere focusing on weather forecasting}} [1] => {{About|the study of weather|the treatise by Aristotle|Meteorology (Aristotle)|the science of measurement|Metrology|the study of meteors|Meteoritics}} [2] => {{Use dmy dates|date=October 2020}} [3] => {{Weather}} [4] => {{Atmospheric sciences}} [5] => [6] => '''Meteorology''' is a branch of the [[atmospheric science]]s (which include atmospheric chemistry and physics) with a major focus on [[weather forecasting]]. The study of meteorology dates back [[Millennium|millennia]], though significant progress in meteorology did not begin until the 18th century. The 19th century saw modest progress in the field after weather observation networks were formed across broad regions. Prior attempts at [[Weather prediction|prediction of weather]] depended on historical data. It was not until after the elucidation of the laws of physics, and more particularly in the latter half of the 20th century, the development of the computer (allowing for the automated solution of a great many modelling equations) that significant breakthroughs in weather forecasting were achieved. An important branch of weather forecasting is [[marine weather forecasting]] as it relates to maritime and coastal safety, in which weather effects also include atmospheric interactions with large bodies of water. [7] => [8] => [[List of meteorological phenomena|Meteorological phenomena]] are observable weather events that are explained by the science of meteorology. Meteorological phenomena are described and quantified by the variables of Earth's atmosphere: temperature, air pressure, [[Water vapor|water vapour]], [[mass flow rate|mass flow]], and the variations and interactions of these variables, and how they change over time. Different [[Scale (spatial)|spatial scales]] are used to describe and predict weather on local, regional, and global levels. [9] => [10] => Meteorology, [[climatology]], [[atmospheric physics]], and [[atmospheric chemistry]] are sub-disciplines of the [[atmospheric sciences]]. Meteorology and [[hydrology]] compose the interdisciplinary field of [[hydrometeorology]]. The interactions between Earth's atmosphere and its oceans are part of a coupled ocean-atmosphere system. Meteorology has application in many diverse fields such as the military, energy production, transport, agriculture, and construction. [11] => [12] => The word ''[[wikt:meteorology|meteorology]]'' is from the Ancient Greek [[wikt:μετέωρος|μετέωρος]] ''metéōros'' (''meteor'') and [[wikt:-λογία|-λογία]] ''-logia'' (''[[wikt:-logy|-(o)logy]]''), meaning "the study of things high in the air". [13] => [14] => ==History== [15] => {{Main|Timeline of meteorology}} [16] => [17] => ===Ancient meteorology up to the time of Aristotle=== [18] => [[File:AlpineRainbow.jpg|thumb|[[Parhelion|Parhelion (sundog)]] in [[Savoie]]]] [19] => [20] => Early attempts at predicting weather were often related to prophecy and [[divining]], and were sometimes based on astrological ideas. [[History of religion#Origin|Ancient religions]] believed meteorological phenomena to be under the control of the gods.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=1}} The ability to predict [[rain]]s and [[flood]]s based on annual cycles was evidently used by humans at least from the time of agricultural settlement if not earlier. Early approaches to predicting weather were based on [[astrology]] and were practiced by priests. The [[Ancient Egypt|Egyptians]] had [[Rainmaking (ritual)|rain-making rituals]] as early as 3500 BC. [21] => [22] => Ancient Indian [[Upanishads]] contain mentions of clouds and [[season]]s.{{cite web|author=NS, nsimd@ymail.com |url=http://www.imd.gov.in/doc/history/history.htm |title=History of Meteorology in India |publisher=Imd.gov.in |access-date=25 March 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120330125208/http://www.imd.gov.in/doc/history/history.htm |archive-date=30 March 2012 }} The Samaveda mentions sacrifices to be performed when certain phenomena were noticed. [[Varāhamihira]]'s classical work ''Brihatsamhita'', written about 500 AD, provides evidence of weather observation. [23] => [24] => [[Cuneiform]] inscriptions on [[Babylon]]ian tablets included associations between thunder and rain. The [[Babylon|Chaldean]]s differentiated the [[22° halo|22°]] and [[46° halo]]s.{{Cite journal|last=Hellmann|first=G.|date=1 October 1908|title=The dawn of meteorology|journal=Quarterly Journal of the Royal Meteorological Society|language=en|volume=34|issue=148|pages=221–232|doi=10.1002/qj.49703414802|issn=1477-870X|bibcode=1908QJRMS..34..221H}} [25] => [26] => The [[Ancient Greece|ancient Greeks]] were the first to make theories about the weather. Many [[Natural philosophy|natural philosophers]] studied the weather. However, as [[Meteorological instrumentation|meteorological instruments]] did not exist, the inquiry was largely qualitative, and could only be judged by more general theoretical speculations.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=8}} [[Herodotus]] states that [[Thales of Miletus|Thales]] predicted the [[solar eclipse]] of 585 BC. He studied Babylonian equinox tables. {{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=11}} According to Seneca, he gave the explanation that the cause of the [[Nile]]'s annual floods was due to northerly winds hindering its descent by the sea.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=4}} [[Anaximander]] and [[Anaximenes of Miletus|Anaximenes]] thought that thunder and lightning was caused by air smashing against the cloud, thus kindling the flame. Early meteorological theories generally considered that there was a fire-like substance in the atmosphere. Anaximander defined wind as a flowing of air, but this was not generally accepted for centuries. {{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=5}} A theory to explain summer hail was first proposed by [[Anaxagoras]]. He observed that air temperature decreased with increasing height and that clouds contain moisture. He also noted that heat caused objects to rise, and therefore the heat on a summer day would drive clouds to an altitude where the moisture would freeze.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=6}} [[Empedocles]] theorized on the change of the seasons. He believed that fire and water opposed each other in the atmosphere, and when fire gained the upper hand, the result was summer, and when water did, it was winter. [[Democritus]] also wrote about the flooding of the Nile. He said that during the summer solstice, snow in northern parts of the world melted. This would cause vapors to form clouds, which would cause storms when driven to the Nile by northerly winds, thus filling the lakes and the Nile.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=8}} [[Hippocrates]] inquired into the effect of weather on health. [[Eudoxus of Cnidus|Eudoxus]] claimed that bad weather followed four-year periods, according to Pliny.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=9–10}} [27] => [28] => === Aristotelian meteorology === [29] => These early observations would form the basis for [[Aristotle]]'s ''[[Meteorology (Aristotle)|Meteorology]]'', written in 350 BC.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=11}}{{cite web|url=http://www.infoplease.com/ce6/weather/A0859595.html|title=Meteorology: Introduction|website = Infoplease}} Aristotle is considered the founder of meteorology.{{cite web|url=http://yale.edu/ynhti/curriculum/units/1994/5/94.05.01.x.html|title=94.05.01: Meteorology|access-date=16 June 2015|archive-url= https://web.archive.org/web/20160721205842/http://www.yale.edu/ynhti/curriculum/units/1994/5/94.05.01.x.html |archive-date=21 July 2016|url-status=dead}} One of the most impressive achievements described in the ''Meteorology'' is the description of what is now known as the [[Water Cycle|hydrologic cycle]]. His work would remain an authority on meteorology for nearly 2,000 years.{{Cite book|last=Aristotle | authorlink= Aristotle | title=Meteorology |url=http://etext.library.adelaide.edu.au/a/aristotle/meteorology/ |year=2004 |location=The University of Adelaide Library, University of Adelaide, South Australia 5005 |quote=Translated by E.W. Webster |orig-year=350 BCE |url-status=dead |archive-url=https://web.archive.org/web/20070217110549/http://etext.library.adelaide.edu.au/a/aristotle/meteorology/ |archive-date=17 February 2007 }} [30] => [31] => The book [[De Mundo]] (composed before 250 BC or between 350 and 200 BC) noted:{{cite book |author=Aristotle; Forster, E. S. (Edward Seymour), 1879–1950; Dobson, J. F. (John Frederic), 1875–1947 |url=https://archive.org/details/demundoarisrich |title=De Mundo |publisher=Oxford : The Clarendon Press |year=1914 |page=Chapter 4}} [32] => :If the flashing body is set on fire and rushes violently to the Earth it is called a thunderbolt; if it is only half of fire, but violent also and massive, it is called a ''meteor''; if it is entirely free from fire, it is called a smoking bolt. They are all called 'swooping bolts' because they swoop down upon the Earth. Lightning is sometimes smoky and is then called 'smoldering lightning"; sometimes it darts quickly along and is then said to be ''vivid''. At other times, it travels in crooked lines, and is called ''forked lightning''. When it swoops down upon some object it is called 'swooping lightning' [33] => [34] => After Aristotle, progress in meteorology stalled for a long time. [[Theophrastus]] compiled a book on weather forecasting, called the ''Book of Signs'', as well as ''On Winds''. He gave hundreds of signs for weather phenomena for a period up to a year.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=25}} His system was based on dividing the year by the setting and the rising of the Pleiad, halves into solstices and equinoxes, and the continuity of the weather for those periods. He also divided months into the new moon, fourth day, eighth day and full moon, in likelihood of a change in the weather occurring. The day was divided into sunrise, mid-morning, noon, mid-afternoon and sunset, with corresponding divisions of the night, with change being likely at one of these divisions.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=25–26}} Applying the divisions and a principle of balance in the yearly weather, he came up with forecasts like that if a lot of rain falls in the winter, the spring is usually dry. Rules based on actions of animals are also present in his work, like that if a dog rolls on the ground, it is a sign of a storm. Shooting stars and the Moon were also considered significant. However, he made no attempt to explain these phenomena, referring only to the Aristotelian method.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=26}} The work of Theophrastus remained a dominant influence in weather forecasting for nearly 2,000 years.{{cite web |title=Weather: Forecasting from the Beginning |url=http://www.infoplease.com/cig/weather/forecasting-from-beginning.html |website=Infoplease}} [35] => [36] => === Meteorology after Aristotle === [37] => Meteorology continued to be studied and developed over the centuries, but it was not until the Renaissance in the 14th to 17th centuries that significant advancements were made in the field. Scientists such as Galileo and Descartes introduced new methods and ideas, leading to the scientific revolution in meteorology. [38] => [39] => Speculation on the cause of the flooding of the Nile ended when [[Eratosthenes]], according to [[Proclus]], stated that it was known that man had gone to the sources of the Nile and observed the rains, although interest in its implications continued.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=26}} [40] => [41] => During the era of [[Greece in the Roman era|Roman Greece]] and Europe, scientific interest in meteorology waned. In the 1st century BC, most natural philosophers claimed that the clouds and winds extended up to 111 miles, but [[Posidonius]] thought that they reached up to five miles, after which the air is clear, liquid and luminous. He closely followed Aristotle's theories. By the end of the second century BC, the center of science shifted from Athens to [[History of Alexandria#Roman era|Alexandria]], home to the ancient [[Library of Alexandria]]. In the 2nd century AD, [[Ptolemy]]'s [[Almagest]] dealt with meteorology, because it was considered a subset of astronomy. He gave several astrological weather predictions.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=27}} He constructed a map of the world divided into climatic zones by their illumination, in which the length of the Summer solstice increased by half an hour per zone between the equator and the Arctic.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=28}} Ptolemy wrote on the [[atmospheric refraction]] of light in the context of astronomical observations.Smith AM, 1996. "Ptolemy's Theory of Visual Perception: An English Translation of the Optics", pp. 46. ''Transactions of the American Philosophical Society'' vol. 86, part 2. [42] => [43] => In 25 AD, [[Pomponius Mela]], a Roman geographer, formalized the climatic zone system.{{cite web |url=http://www.paleorama.com/timelines/geography.html |archive-url=https://archive.today/20120906121823/http://www.paleorama.com/timelines/geography.html |url-status=dead |archive-date=6 September 2012 |title=Timeline of geography, paleontology |publisher=Paleorama.com |quote=Following the path of Discovery }} In 63–64 AD, [[Seneca the Younger|Seneca]] wrote ''[[Naturales quaestiones]]''. It was a compilation and synthesis of ancient Greek theories. However, theology was of foremost importance to Seneca, and he believed that phenomena such as lightning were tied to fate.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=29–30}} The second book(chapter) of [[Pliny the Elder|Pliny]]'s [[Natural History (Pliny)|Natural History]] covers meteorology. He states that more than twenty ancient Greek authors studied meteorology. He did not make any personal contributions, and the value of his work is in preserving earlier speculation, much like Seneca's work.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=30}} [44] => [45] => [[File:Golden Gate Bridge as seen at twilight from Baker Beach.jpg|Twilight at [[Baker Beach]]|thumb]] [46] => [47] => From 400 to 1100, scientific learning in Europe was preserved by the clergy. [[Isidore of Seville]] devoted a considerable attention to meteorology in ''[[Etymologiae]]'', ''De ordine creaturum'' and ''De natura rerum''. [[Bede|Bede the Venerable]] was the first Englishman to write about the weather in ''[[De natura rerum (Bede)|De Natura Rerum]]'' in 703. The work was a summary of then extant classical sources. However, Aristotle's works were largely lost until the twelfth century, including ''Meteorologica''. Isidore and Bede were scientifically minded, but [[Relationship between religion and science#Middle Ages and Renaissance|they adhered to the letter of Scripture]].{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=30–31}} [48] => [49] => [[Islamic Golden Age|Islamic civilization]] translated many ancient works into Arabic which were [[Transmission of the Greek Classics|transmitted]] and translated in western Europe to Latin.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=31}} [50] => [51] => In the 9th century, [[Al-Dinawari]] wrote the ''Kitab al-Nabat'' (Book of Plants), in which he deals with the application of meteorology to [[agriculture]] during the [[Arab Agricultural Revolution]]. He describes the meteorological character of the sky, the [[planet]]s and [[constellation]]s, the [[sun]] and [[moon]], the [[lunar phase]]s indicating [[season]]s and rain, the ''anwa'' ([[Astronomical object|heavenly bodies]] of rain), and atmospheric phenomena such as winds, thunder, lightning, snow, floods, valleys, rivers, lakes.{{citation |last=Fahd |first=Toufic |title=Botany and agriculture |page=815}}{{cite book |last1=Morelon |first1=Régis |title=Encyclopedia of the History of Arabic Science |title-link=Encyclopedia of the History of Arabic Science |last2=Rashed |first2=Roshdi |publisher=[[Routledge]] |year=1996 |isbn=978-0-415-12410-2 |volume=3 |pages=815–816}} [52] => [53] => In 1021, [[Alhazen]] showed that atmospheric refraction is also responsible for [[twilight]] in ''[[Book of Optics|Opticae thesaurus]]''; he estimated that twilight begins when the sun is 19 degrees below the [[horizon]], and also used a geometric determination based on this to estimate the maximum possible height of the [[Earth's atmosphere]] as 52,000 ''passim'' (about 49 miles, or 79 km).{{Cite journal |last1=Frisinger |first1=H. Howard |year=1973 |title=Aristotle's Legacy in Meteorology |journal=Bulletin of the American Meteorological Society |volume=54 |issue=3 |page=198 |bibcode=1973BAMS...54..198F |doi=10.1175/1520-0477(1973)054<0198:ALIM>2.0.CO;2 |issn=1520-0477 |doi-access=free}} [54] => [55] => [[Adelard of Bath]] was one of the early translators of the classics. He also discussed meteorological topics in his ''Quaestiones naturales''. He thought dense air produced propulsion in the form of wind. He explained thunder by saying that it was due to ice colliding in clouds, and in Summer it melted. In the thirteenth century, Aristotelian theories reestablished dominance in meteorology. For the next four centuries, meteorological work by and large was mostly [[Commentaries on Aristotle|commentary]]. It has been estimated over 156 commentaries on the ''Meteorologica'' were written before 1650.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=32}} [56] => [57] => Experimental evidence was less important than appeal to the classics and authority in medieval thought. In the thirteenth century, [[Roger Bacon]] advocated experimentation and the mathematical approach. In his ''[[Opus Majus|Opus majus]]'', he followed Aristotle's theory on the atmosphere being composed of water, air, and fire, supplemented by optics and geometric proofs. He noted that Ptolemy's climatic zones had to be adjusted for [[topography]].{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=33}} [58] => [59] => [[St. Albert the Great]] was the first to propose that each drop of falling rain had the form of a small sphere, and that this form meant that the rainbow was produced by light interacting with each raindrop.{{cite web|url=http://rammb.cira.colostate.edu/dev/hillger/ancient.htm#magnus|title=Ancient and pre-Renaissance Contributors to Meteorology|access-date=16 June 2015}} [[Roger Bacon]] was the first to calculate the angular size of the rainbow. He stated that a rainbow summit cannot appear higher than 42 degrees above the horizon.{{cite book|author1=Raymond L. Lee|author2=Alistair B. Fraser|title=The Rainbow Bridge: Rainbows in Art, Myth, and Science|url=https://books.google.com/books?id=kZcCtT1ZeaEC&pg=PA155|year=2001|publisher=Penn State Press|isbn=978-0-271-01977-2|page=155}} [60] => [61] => In the late 13th century and early 14th century, [[Kamāl al-Dīn al-Fārisī]] and [[Theodoric of Freiberg]] were the first to give the correct explanations for the primary [[rainbow]] phenomenon. [[Theodoric of Freiberg|Theoderic]] went further and also explained the secondary rainbow.{{Cite web|title=Theodoric of Freiberg and Kamal al-Din al-Farisi Independently Formulate the Correct Qualitative Description of the Rainbow {{!}} Encyclopedia.com|url=https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/theodoric-freiberg-and-kamal-al-din-al-farisi-independently-formulate-correct-qualitative|website=www.encyclopedia.com|access-date=16 May 2020}} [62] => [63] => By the middle of the sixteenth century, meteorology had developed along two lines: theoretical science based on ''Meteorologica'', and astrological weather forecasting. The pseudoscientific prediction by natural signs became popular and enjoyed protection of the church and princes. This was supported by scientists like [[Regiomontanus|Johannes Muller]], [[Leonard Digges (scientist)|Leonard Digges]], and [[Johannes Kepler]]. However, there were skeptics. In the 14th century, [[Nicole Oresme]] believed that weather forecasting was possible, but that the rules for it were unknown at the time. Astrological influence in meteorology persisted until the eighteenth century.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=33,36}} [64] => [65] => [[Gerolamo Cardano]]'s ''De Subilitate'' (1550) was the first work to challenge fundamental aspects of Aristotelian theory. Cardano maintained that there were only three basic elements- earth, air, and water. He discounted fire because it needed material to spread and produced nothing. Cardano thought there were two kinds of air: free air and enclosed air. The former destroyed inanimate things and preserved animate things, while the latter had the opposite effect.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=36–37}} [66] => [67] => [[René Descartes|Rene Descartes]]'s [[Discourse on the Method]] (1637) typifies the beginning of the [[Scientific Revolution|scientific revolution]] in meteorology. His scientific method had four principles: to never accept anything unless one clearly knew it to be true; to divide every difficult problem into small problems to tackle; to proceed from the simple to the complex, always seeking relationships; to be as complete and thorough as possible with no prejudice.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=37}} [68] => [69] => In the appendix ''Les Meteores'', he applied these principles to meteorology. He discussed terrestrial bodies and vapors which arise from them, proceeding to explain the formation of clouds from drops of water, and winds, clouds then dissolving into rain, hail and snow. He also discussed the effects of light on the rainbow. Descartes hypothesized that all bodies were composed of [[Atomism#Atomist renaissance|small particles]] of different shapes and interwovenness. All of his theories were based on this hypothesis. He explained the rain as caused by clouds becoming too large for the air to hold, and that clouds became snow if the air was not warm enough to melt them, or hail if they met colder wind. Like his predecessors, Descartes's method was deductive, as [[Meteorological instrumentation|meteorological instruments]] were not developed and extensively used yet. He introduced the [[Cartesian coordinate system]] to meteorology and stressed the importance of mathematics in natural science. His work established meteorology as a legitimate branch of physics.{{Cite book |last=Frisinge |first=H. Howard |title=The History of Meteorology: to 1800 |publisher=[[American Meteorological Society]] |year=1983 |isbn=978-1-940033-91-4 |pages=37–40}} [70] => [71] => In the 18th century, the invention of the thermometer and barometer allowed for more accurate measurements of temperature and pressure, leading to a better understanding of atmospheric processes. This century also saw the birth of the first meteorological society, the Societas Meteorologica Palatina in 1780.{{cite journal |last1=Börngen |first1=Michael |last2=Foken |first2=Thomas |title=150 Years: The Leipzig Meteorological Conference, 1872, a Milestone in International Meteorological Cooperation |journal=Meteorologische Zeitschrift |date=2022 |volume=31 |issue=5 |pages=415–427 |doi=10.1127/metz/2022/1134 |bibcode=2022MetZe..31..415B |s2cid=251295416 |url=https://doi.org/10.1127/metz/2022/1134 |access-date=2023-10-14 |ref=Börngen2022|doi-access=free }} [72] => [73] => In the 19th century, advances in technology such as the telegraph and photography led to the creation of weather observing networks and the ability to track storms. Additionally, scientists began to use mathematical models to make predictions about the weather. The 20th century saw the development of radar and satellite technology, which greatly improved the ability to observe and track weather systems. In addition, meteorologists and atmospheric scientists started to create the first weather forecasts and temperature predictions.{{Cite web |date=2002-02-25 |title=Weather Forecasting Through the Ages |url=https://earthobservatory.nasa.gov/features/WxForecasting/wx2.php |access-date=2023-12-09 |website=earthobservatory.nasa.gov |language=en}} [74] => [75] => In the 20th and 21st centuries, with the advent of computer models and big data, meteorology has become increasingly dependent on numerical methods and computer simulations. This has greatly improved weather forecasting and climate predictions. Additionally, meteorology has expanded to include other areas such as air quality, atmospheric chemistry, and climatology. The advancement in observational, theoretical and computational technologies has enabled ever more accurate weather predictions and understanding of weather pattern and air pollution. In current time, with the advancement in weather forecasting and satellite technology, meteorology has become an integral part of everyday life, and is used for many purposes such as aviation, agriculture, and disaster management.{{Citation needed|date=January 2023}} [76] => [77] => === Instruments and classification scales === [78] => {{See also|Beaufort scale|Celsius|Fahrenheit}} [79] => [[File:Wea00920.jpg|thumb|upright|A hemispherical cup anemometer]] [80] => [81] => In 1441, [[Sejong the Great of Joseon|King Sejong]]'s son, Prince Munjong of Korea, invented the first standardized [[rain gauge]].{{Cite book|url=https://books.google.com/books?id=4taaVmhmd8sC&pg=PA151|title=Earth Science' 2005 Ed.|publisher=Rex Bookstore, Inc.|isbn=978-971-23-3938-7|page=151}} These were sent throughout the [[Joseon dynasty]] of [[Korea]] as an official tool to assess land taxes based upon a farmer's potential harvest. In 1450, [[Leone Battista Alberti]] developed a swinging-plate [[anemometer]], and was known as the first ''anemometer''.{{Cite book |last=Jacobson |first=Mark Z. |title=Fundamentals of Atmospheric Modeling |type=paperback |edition=2nd |date=June 2005 |publisher=Cambridge University Press |location=New York |isbn=978-0-521-54865-6 |page=828}} In 1607, [[Galileo Galilei]] constructed a [[Galileo thermometer|thermoscope]]. In 1611, [[Johannes Kepler]] wrote the first scientific treatise on snow crystals: "Strena Seu de Nive Sexangula (A New Year's Gift of Hexagonal Snow)."{{cite web|url=http://www.its.caltech.edu/~atomic/snowcrystals/earlyobs/earlyobs.htm|title=Early Snow Crystal Observations|access-date=16 June 2015}} In 1643, [[Evangelista Torricelli]] invented the mercury [[barometer]]. In 1662, Sir [[Christopher Wren]] invented the mechanical, self-emptying, tipping bucket rain gauge. In 1714, [[Gabriel Fahrenheit]] created a reliable scale for measuring temperature with a mercury-type [[thermometer]].Grigull, U., Fahrenheit, a Pioneer of Exact Thermometry. Heat Transfer, 1966, The Proceedings of the 8th International Heat Transfer Conference, San Francisco, 1966, Vol. 1. In 1742, [[Anders Celsius]], a Swedish astronomer, proposed the "centigrade" temperature scale, the predecessor of the current [[Celsius]] scale.{{cite web|url=https://www.astro.uu.se/history/Celsius_scale.html |title=History of the Celsius temperature scale |last=Beckman |first=Olof |date=2001 |work=[[Uppsala Astronomical Observatory]] |archive-url=https://web.archive.org/web/20090722030732/https://www.astro.uu.se/history/Celsius_scale.html |archive-date=22 July 2009 |url-status=dead}} In 1783, the first hair [[hygrometer]] was demonstrated by [[Horace-Bénédict de Saussure]]. In 1802–1803, [[Luke Howard]] wrote ''On the Modification of Clouds'', in which he assigns [[List of cloud types|cloud types]] Latin names.Thornes, John. E. (1999). ''John Constable's Skies.'' The University of Birmingham Press, pp. 189. {{ISBN|1-902459-02-4}}. In 1806, [[Francis Beaufort]] introduced his [[Beaufort scale|system for classifying wind speeds]].{{cite web|url=https://www.bbc.co.uk/weather/features/understanding/beaufort_scale.shtml |title=Beaufort Scale |last=Giles |first=Bill |work=BBC Weather |access-date=12 May 2009 |archive-url=https://web.archive.org/web/20101015004110/https://www.bbc.co.uk/weather/features/understanding/beaufort_scale.shtml |archive-date=15 October 2010 |url-status=dead}} Near the end of the 19th century the first [[cloud atlas]]es were published, including the ''[[International Cloud Atlas]]'', which has remained in print ever since. The April 1960 launch of the first successful [[weather satellite]], [[TIROS-1]], marked the beginning of the age where weather information became available globally. [82] => [83] => ===Atmospheric composition research=== [84] => In 1648, [[Blaise Pascal]] rediscovered that [[atmospheric pressure]] decreases with height, and deduced that there is a vacuum above the atmosphere.Florin to Pascal, September 1647, ''Œuves completes de Pascal'', 2:682. In 1738, [[Daniel Bernoulli]] published ''Hydrodynamics'', initiating the [[Kinetic theory of gases]] and established the basic laws for the theory of gases.{{MacTutor Biography|id=Bernoulli_Daniel}} In 1761, [[Joseph Black]] discovered that ice absorbs heat without changing its temperature when melting. In 1772, Black's student [[Daniel Rutherford]] discovered [[nitrogen]], which he called ''phlogisticated air'', and together they developed the [[phlogiston theory]].[http://www.londonmet.ac.uk/genesis/search/$-search-results.cfm?CCODE=2476 Biographical note at "Lectures and Papers of Professor Daniel Rutherford (1749–1819), and Diary of Mrs Harriet Rutherford"] {{Webarchive|url=https://web.archive.org/web/20120207075410/http://www.londonmet.ac.uk/genesis/search/$-search-results.cfm?CCODE=2476 |date=7 February 2012 }}. In 1777, [[Antoine Lavoisier]] discovered [[oxygen]] and developed an explanation for combustion."Sur la combustion en général" ("On Combustion in general", 1777) and "Considérations Générales sur la Nature des Acides" ("General Considerations on the Nature of Acids", 1778). In 1783, in Lavoisier's essay "Reflexions sur le phlogistique,"Nicholas W. Best, "[https://link.springer.com/article/10.1007/s10698-015-9220-5 Lavoisier's 'Reflections on Phlogiston' I: Against Phlogiston Theory"], ''[[Foundations of Chemistry]]'', 2015, '''17''', 137–151. he deprecates the phlogiston theory and proposes a [[caloric theory]].Nicholas W. Best, [https://link.springer.com/article/10.1007/s10698-015-9236-x Lavoisier's 'Reflections on Phlogiston' II: On the Nature of Heat], ''[[Foundations of Chemistry]]'', 2015, '''17'''. In this early work, Lavoisier calls it "igneous fluid".The 1880 edition of [[A Guide to the Scientific Knowledge of Things Familiar]], a 19th-century educational science book, explained heat transfer in terms of the flow of caloric. In 1804, [[John Leslie (physicist)|John Leslie]] observed that a matte black surface radiates heat more effectively than a polished surface, suggesting the importance of [[black-body radiation]]. In 1808, [[John Dalton]] defended caloric theory in ''A New System of Chemistry'' and described how it combines with matter, especially gases; he proposed that the [[heat capacity]] of gases varies inversely with [[atomic weight]]. In 1824, [[Nicolas Léonard Sadi Carnot|Sadi Carnot]] analyzed the efficiency of [[steam engine]]s using caloric theory; he developed the notion of a [[reversible process (thermodynamics)|reversible process]] and, in postulating that no such thing exists in nature, laid the foundation for the [[second law of thermodynamics]]. In 1716, Edmund Halley suggested that [[aurora]]e are caused by "magnetic effluvia" moving along the [[Earth's magnetic field]] lines. [85] => [86] => ===Research into cyclones and air flow=== [87] => [[File:Earth Global Circulation - en.svg|thumb|upright=1.35|General circulation of the Earth's atmosphere: The westerlies and trade winds are part of the Earth's atmospheric circulation.]] [88] => {{Main|Coriolis effect|Prevailing winds}} [89] => [90] => In 1494, [[Christopher Columbus]] experienced a tropical cyclone, which led to the first written European account of a hurricane.Morison, Samuel Eliot, ''Admiral of the Ocean Sea: A Life of Cristopher Columbus'', Boston, 1942, page 617. In 1686, [[Edmund Halley]] presented a systematic study of the [[trade winds]] and [[monsoon]]s and identified solar heating as the cause of atmospheric motions.Cook, Alan H., ''Edmond Halley: Charting the Heavens and the Seas'' (Oxford: Clarendon Press, 1998) In 1735, an ''ideal'' explanation of [[Atmospheric circulation|global circulation]] through study of the [[trade winds]] was written by [[George Hadley]].George Hadley, "Concerning the cause of the general trade winds", ''Philosophical Transactions'', vol. 39 (1735). In 1743, when [[Benjamin Franklin]] was prevented from seeing a lunar eclipse by a [[tropical cyclone|hurricane]], he decided that cyclones move in a contrary manner to the winds at their periphery.{{cite web|last=Dorst |first=Neal |title=FAQ: Hurricane Timeline |url=http://www.aoml.noaa.gov/hrd/tcfaq/J6.html |date=1 June 2017 |website=aoml.noaa.gov |publisher=[[Atlantic Oceanographic and Meteorological Laboratory|AOML]] |archive-url=https://web.archive.org/web/20190605093128/http://www.aoml.noaa.gov/hrd/tcfaq/J6.html |archive-date=5 June 2019 |url-status=dead}} Understanding the kinematics of how exactly the rotation of the Earth affects airflow was partial at first. Gaspard-Gustave Coriolis published a paper in 1835 on the energy yield of machines with rotating parts, such as waterwheels.{{Cite journal |author=G-G Coriolis |title=Sur les équations du mouvement relatif des systèmes de corps |journal=Journal de l'École Royale Polytechnique |volume=15 |pages=144–154 |year=1835}} In 1856, [[William Ferrel]] proposed the existence of a [[Ferrel cell|circulation cell]] in the mid-latitudes, and the air within deflected by the Coriolis force resulting in the prevailing westerly winds.{{cite web|first=William |last=Ferrel |author-link=William Ferrel |url=http://www.aos.princeton.edu/WWWPUBLIC/gkv/history/ferrel-nashville56.pdf |title=An Essay on the Winds and the Currents of the Ocean |date=4 October 1856 |archive-url=https://web.archive.org/web/20131011124201/http://www.aos.princeton.edu/WWWPUBLIC/gkv/history/ferrel-nashville56.pdf |archive-date=11 October 2013 |url-status=dead |access-date=1 January 2009}} Late in the 19th century, the motion of air masses along [[isobar (meteorology)|isobar]]s was understood to be the result of the large-scale interaction of the [[pressure gradient force]] and the deflecting force. By 1912, this deflecting force was named the Coriolis effect.{{Cite book |title=The Dynamics of Particles and of Rigid, Elastic, and Fluid Bodies |author=Arthur Gordon Webster |publisher=B.G. Teubner |year=1912 |page=[https://archive.org/details/dynamicsparticl04websgoog/page/n336 320] |url=https://archive.org/details/dynamicsparticl04websgoog|quote=coriolis centrifugal force 0-1920. }} Just after World War I, a group of meteorologists in Norway led by [[Vilhelm Bjerknes]] developed the [[Norwegian cyclone model]] that explains the generation, intensification and ultimate decay (the life cycle) of [[extratropical cyclone|mid-latitude cyclones]], and introduced the idea of [[front (meteorology)|fronts]], that is, sharply defined boundaries between [[air mass]]es.{{cite web|first=Shaye |last=Johnson |url=http://weather.ou.edu/~metr4424/Files/Norwegian_Cyclone_Model.pdf |title=The Norwegian Cyclone Model |date=2003 |website=weather.ou.edu |publisher=The University of Oklahoma |archive-url=https://web.archive.org/web/20060901163934/http://weather.ou.edu/~metr4424/Files/Norwegian_Cyclone_Model.pdf |archive-date=1 September 2006 |url-status=dead |access-date=11 October 2006}} The group included [[Carl-Gustaf Rossby]] (who was the first to explain the large scale atmospheric flow in terms of [[fluid dynamics]]), [[Tor Bergeron]] (who first determined how rain forms) and [[Jacob Bjerknes]]. [91] => [92] => ===Observation networks and weather forecasting=== [93] => [[File:Wolkenstockwerke.png|thumb|upright=1.35|Cloud classification by altitude of occurrence]] [94] => [[File:Hyetographic_or_Rain_Map_of_the_World_1848_Alexander_Keith_Johnston.png|thumb|upright=1.35|right|This "Hyetographic or Rain Map of the World" was first published 1848 by [[Alexander Keith Johnston (1804–1871)|Alexander Keith Johnston]].]] [95] => [[File:Hyetographic_or_Rain_Map_of_Europe_1848_Alexander_Keith_Johnston.png|thumb|upright=1.35|right|This "Hyetographic or Rain Map of Europe" was also published in 1848 as part of "The Physical Atlas".]] [96] => {{See also|History of surface weather analysis}} [97] => [98] => In the late 16th century and first half of the 17th century a range of meteorological instruments were invented – the [[thermometer]], [[barometer]], [[hydrometer]], as well as wind and rain gauges. In the 1650s natural philosophers started using these instruments to systematically record weather observations. Scientific academies established weather diaries and organised observational networks.{{Cite book|title = The Oxford Companion to the History of Modern Science|publisher=Oxford University Press|date=2003|author=John L. Heilbron|isbn=9780199743766|pages=518}} In 1654, [[Ferdinando II de Medici]] established the first ''weather observing'' network, that consisted of meteorological stations in [[Florence]], [[Cutigliano]], [[Vallombrosa]], [[Bologna]], [[Parma]], [[Milan]], [[Innsbruck]], [[Osnabrück]], Paris and [[Warsaw]]. The collected data were sent to Florence at regular time intervals.Raymond S. Bradley, Philip D. Jones, ''Climate Since A.D. 1500'', Routledge, 1992, {{ISBN|0-415-07593-9}}, p.144 In the 1660s [[Robert Hooke]] of the [[Royal Society of London]] sponsored networks of weather observers. [[Hippocrates]]' treatise ''Airs, Waters, and Places'' had linked weather to disease. Thus early meteorologists attempted to correlate weather patterns with epidemic outbreaks, and the climate with public health. [99] => [100] => During the [[Age of Enlightenment]] meteorology tried to rationalise traditional weather lore, including astrological meteorology. But there were also attempts to establish a theoretical understanding of weather phenomena. [[Edmond Halley]] and [[George Hadley]] tried to explain [[trade winds]]. They reasoned that the rising mass of heated equator air is replaced by an inflow of cooler air from high latitudes. A flow of warm air at high altitude from equator to poles in turn established an early picture of circulation. Frustration with the lack of discipline among weather observers, and the poor quality of the instruments, led the early modern [[nation states]] to organise large observation networks. Thus, by the end of the 18th century, meteorologists had access to large quantities of reliable weather data. In 1832, an electromagnetic telegraph was created by [[Baron Schilling]].{{cite web|first=Rebecca |last=Martin |date=2009 |url=http://www.abc.net.au/cgi-bin/common/printfriendly.pl?%2Fcatapult%2Findepth%2Ftelegraph.htm |title=News on the wire |website=[[ABC Online]] |archive-url=https://web.archive.org/web/20160303171042/https://www.abc.net.au/cgi-bin/common/printfriendly.pl?%2Fcatapult%2Findepth%2Ftelegraph.htm |archive-date=3 March 2016 |url-status=dead |access-date=12 May 2009}} The arrival of the [[electrical telegraph]] in 1837 afforded, for the first time, a practical method for quickly gathering [[surface weather observation]]s from a wide area.{{cite web|url=http://memory.loc.gov/ammem/sfbmhtml/sfbmtelessay.html |title=The Invention of the Telegraph |last=Bruno |first=Leonard C. |access-date=1 January 2009 |publisher=[[Library of Congress]] |website=memory.loc.gov |archive-url=https://web.archive.org/web/20090111022122/http://memory.loc.gov/ammem/sfbmhtml/sfbmtelessay.html |archive-date=11 January 2009 |url-status=dead}} [101] => [102] => This data could be used to produce maps of the state of the atmosphere for a region near the Earth's surface and to study how these states evolved through time. To make frequent weather forecasts based on these data required a reliable network of observations, but it was not until 1849 that the [[Smithsonian Institution]] began to establish an observation network across the United States under the leadership of [[Joseph Henry]].{{cite web|url=http://www.si.edu/archives/ihd/jhp/joseph03.htm |title=Smithsonian Institution Archives |access-date=16 June 2015 |url-status=dead |archive-url=https://web.archive.org/web/20061020020548/http://www.si.edu/archives/ihd/jhp/joseph03.htm |archive-date=20 October 2006 }} Similar observation networks were established in Europe at this time. The Reverend [[William Clement Ley]] was key in understanding of cirrus clouds and early understandings of [[Jet Stream]]s.{{cite web|url=https://www.rmets.org/event/66b0c4c8-1f3a-e511-80d0-005056b14b19/abstract/fa253828-213a-e511-80d0-005056b14b19|title=Prophet without Honour: The Reverend William Clement Ley and the hunt for the jet stream|work=rmets.org|access-date=13 October 2016|archive-url=https://web.archive.org/web/20160828052608/https://www.rmets.org/event/66b0c4c8-1f3a-e511-80d0-005056b14b19/abstract/fa253828-213a-e511-80d0-005056b14b19|archive-date=28 August 2016|url-status=dead}} [[Charles Kenneth Mackinnon Douglas]], known as 'CKM' Douglas read Ley's papers after his death and carried on the early study of weather systems.{{cite journal|title=Meteorologist's profile — Charles Kenneth Mackinnon Douglas, OBE, AFC, MA|journal = Weather|first=M.|last=Field|date=1 October 1999|volume=54|issue=10|pages=321–327|doi=10.1002/j.1477-8696.1999.tb03992.x|bibcode=1999Wthr...54..321F| s2cid=120325369 }} [103] => Nineteenth century researchers in meteorology were drawn from military or medical backgrounds, rather than trained as dedicated scientists.{{Cite journal|last=Williamson|first=Fiona|date=1 September 2015|title=Weathering the empire: meteorological research in the early British straits settlements|journal=The British Journal for the History of Science|volume=48|issue=3|pages=475–492|doi=10.1017/S000708741500028X|pmid=26234178|issn=1474-001X|url=https://ink.library.smu.edu.sg/soss_research/2662}} In 1854, the United Kingdom government appointed [[Robert FitzRoy]] to the new office of ''Meteorological Statist to the Board of Trade'' with the task of gathering weather observations at sea. FitzRoy's office became the [[Met Office|United Kingdom Meteorological Office]] in 1854, the second oldest national meteorological service in the world (the [[Central Institution for Meteorology and Geodynamics]] (ZAMG) in Austria was founded in 1851 and is the oldest weather service in the world). The first daily weather forecasts made by FitzRoy's Office were published in ''[[The Times]]'' newspaper in 1860. The following year a system was introduced of hoisting storm warning cones at principal ports when a gale was expected. [104] => [105] => FitzRoy coined the term "weather forecast" and tried to separate scientific approaches from prophetic ones.{{cite journal |author=Anderson, Katharine |year=1999 |title=The weather prophets: science and reputation in Victorian meteorology |journal=History of Science |volume=37 |issue=2 |pages=179–215 |bibcode=1999HisSc..37..179A |doi=10.1177/007327539903700203 |s2cid=142652078}} [106] => [107] => Over the next 50 years, many countries established national meteorological services. The [[India Meteorological Department]] (1875) was established to follow tropical cyclone and [[monsoon]].{{cite web|publisher=[[India Meteorological Department]] |url=http://www.imd.gov.in/doc/history/eastablishment-of-imd.htm |title=Establishment of IMD |website=imd.gov.in |archive-url=https://web.archive.org/web/20151120224108/http://www.imd.gov.in/doc/history/eastablishment-of-imd.htm |archive-date=20 November 2015 |url-status=dead |access-date=1 January 2009}} The Finnish Meteorological Central Office (1881) was formed from part of Magnetic Observatory of [[Helsinki University]].{{cite web|publisher=[[Finnish Meteorological Institute]] |url=http://www.fmi.fi/organization/history.html |title=History of Finnish Meteorological Institute |website=fmi.fi |archive-url=https://web.archive.org/web/20100725213620/http://www.fmi.fi/organization/history.html |archive-date=25 July 2010 |url-status=dead |access-date=1 January 2009}} Japan's Tokyo Meteorological Observatory, the forerunner of the [[Japan Meteorological Agency]], began constructing surface weather maps in 1883.{{cite web|publisher=[[Japan Meteorological Agency]] |url=http://www.jma.go.jp/jma/en/History/indexe_his.htm |title=History |website=jma.go.jp |archive-url=https://web.archive.org/web/20101225034901/http://www.jma.go.jp/jma/en/History/indexe_his.htm |archive-date=25 December 2010 |url-status=dead |access-date=22 October 2006}} The [[United States Weather Bureau]] (1890) was established under the [[United States Department of Agriculture]]. The [[Bureau of Meteorology|Australian Bureau of Meteorology]] (1906) was established by a Meteorology Act to unify existing state meteorological services.{{cite web |url=http://www.abc.net.au/news/stories/2008/01/01/2129737.htm |title=BOM celebrates 100 years |publisher=[[Australian Broadcasting Corporation]]|date=31 December 2007 }}{{cite web |title=Collections in Perth: 20. Meteorology |publisher=National Archives of Australia |url=http://www.naa.gov.au/naaresources/Publications/research_guides/guides/perth/chapter20.htm |access-date=24 May 2008 |archive-url=https://web.archive.org/web/20120212210812/http://www.naa.gov.au/naaresources/Publications/research_guides/guides/perth/chapter20.htm |archive-date=12 February 2012 |url-status=dead }} [108] => [109] => ===Numerical weather prediction=== [110] => {{Main|Numerical weather prediction}} [111] => [[File:IBM 7090 console used by a meteorologist, 1965.jpg|thumb|left|A meteorologist at the console of the IBM 7090 in the Joint Numerical Weather Prediction Unit, {{Circa|1965}}]] [112] => [113] => In 1904, Norwegian scientist [[Vilhelm Bjerknes]] first argued in his paper ''Weather Forecasting as a Problem in Mechanics and Physics'' that it should be possible to forecast weather from calculations based upon [[physical law|natural laws]].Berknes, V. (1904) "Das Problem der Wettervorhersage, betrachtet vom Standpunkte der Mechanik und der Physik" (The problem of weather prediction, considered from the viewpoints of mechanics and physics), ''Meteorologische Zeitschrift'', '''21''' : 1–7. Available in English on-line at: [http://www.schweizerbart.de/resources/downloads/paper_free/74383.pdf Schweizerbart science publishers].{{cite web |url=http://docs.lib.noaa.gov/rescue/Bibliographies/Bjerknes/Bjerknes_July_2004.pdf |title=Pioneers in Modern Meteorology and Climatology: Vilhelm and Jacob Bjerknes |access-date=13 October 2008}} [114] => [115] => It was not until later in the 20th century that advances in the understanding of atmospheric physics led to the foundation of modern [[numerical weather prediction]]. In 1922, [[Lewis Fry Richardson]] published "Weather Prediction By Numerical Process,"Richardson, Lewis Fry, ''Weather Prediction by Numerical Process'' (Cambridge, England: Cambridge University Press, 1922). Available on-line at: [https://archive.org/stream/weatherpredictio00richrich#page/n7/mode/2up Internet Archive.org]. after finding notes and derivations he worked on as an ambulance driver in World War I. He described how small terms in the prognostic fluid dynamics equations that govern atmospheric flow could be neglected, and a numerical calculation scheme that could be devised to allow predictions. Richardson envisioned a large auditorium of thousands of people performing the calculations. However, the sheer number of calculations required was too large to complete without electronic computers, and the size of the grid and time steps used in the calculations led to unrealistic results. Though numerical analysis later found that this was due to [[numerical instability]]. [116] => [117] => Starting in the 1950s, [[number|numerical]] forecasts with computers became feasible.{{cite web|last=Edwards |first=Paul N. |publisher=[[American Institute of Physics]] |website=aip.org |url=http://www.aip.org/history/sloan/gcm/ |title=Atmospheric General Circulation Modeling |archive-url=https://web.archive.org/web/20080325084036/http://www.aip.org/history/sloan/gcm/ |archive-date=25 March 2008 |url-status=dead |access-date=13 January 2008}} The first [[weather forecast]]s derived this way used [[barotropic]] (single-vertical-level) models, and could successfully predict the large-scale movement of midlatitude [[Rossby wave]]s, that is, the pattern of [[low-pressure area|atmospheric lows]] and [[High-pressure area|highs]].{{cite book |title=Storm Watchers |page=[https://archive.org/details/stormwatcherstur00cox_df1/page/208 208] |year=2002 |author=Cox, John D. |publisher=John Wiley & Sons, Inc. |isbn=978-0-471-38108-2 |url=https://archive.org/details/stormwatcherstur00cox_df1/page/208 }} In 1959, the UK Meteorological Office received its first computer, a [[Ferranti Mercury]].{{Cite web|url=https://www.metoffice.gov.uk/research/modelling-systems/history-of-numerical-weather-prediction|title=The history of Numerical Weather Prediction at the Met Office|website=Met Office|access-date=15 January 2018|archive-date=15 January 2018|archive-url=https://web.archive.org/web/20180115185643/https://www.metoffice.gov.uk/research/modelling-systems/history-of-numerical-weather-prediction|url-status=dead}} [118] => [119] => In the 1960s, the [[Chaos theory|chaotic]] nature of the atmosphere was first observed and mathematically described by [[Edward Lorenz]], founding the field of [[chaos theory]].Edward N. Lorenz, "Deterministic non-periodic flow", ''Journal of the Atmospheric Sciences'', vol. 20, pages 130–141 (1963). These advances have led to the current use of [[ensemble forecasting]] in most major forecasting centers, to take into account uncertainty arising from the chaotic nature of the atmosphere.{{cite web |url=http://www.wpc.ncep.noaa.gov/ensembletraining |author=Manousos, Peter |publisher=[[Hydrometeorological Prediction Center]] |date=19 July 2006 |access-date=31 December 2010 |title=Ensemble Prediction Systems}} Mathematical models used to predict the long term weather of the Earth ([[climate model]]s), have been developed that have a resolution today that are as coarse as the older weather prediction models. These climate models are used to investigate long-term [[climate]] shifts, such as what effects might be caused by human emission of [[greenhouse gas]]es. [120] => [121] => ==Meteorologists== [122] => {{further|Meteorologist}} [123] => [124] => '''Meteorologists''' are scientists who study and work in the field of meteorology.{{cite book|first1=Todd S.|last1=Glickman|location=Cambridge, Massachusetts|date=June 2009|url=http://glossary.ametsoc.org/wiki/Meteorologist |title=Meteorology Glossary|format=electronic|edition=2nd|publisher=[[American Meteorological Society]]|access-date=10 March 2014}} The American Meteorological Society publishes and continually updates an authoritative electronic ''Meteorology Glossary''.{{cite book|first1=Todd S.|last1=Glickman|location=Cambridge, Massachusetts|date=June 2000|url=http://glossary.ametsoc.org/?p=1&query=doldrums|title=Meteorology Glossary|format=electronic|edition=2nd|publisher=[[American Meteorological Society]]|access-date=10 March 2014}} Meteorologists work in [[Government agency|government agencies]], private consulting and [[research]] services, industrial enterprises, utilities, radio and [[television stations]], and in [[education]]. In the United States, meteorologists held about 10,000 jobs in 2018.{{Cite web|url=https://www.bls.gov/ooh/life-physical-and-social-science/atmospheric-scientists-including-meteorologists.htm|title=Atmospheric Scientists, Including Meteorologists : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics|website=www.bls.gov|language=en-us|access-date=24 March 2020}} [125] => [126] => Although weather forecasts and warnings are the best known products of meteorologists for the public, [[weather presenter]]s on radio and television are not necessarily professional meteorologists. They are most often [[reporters]] with little formal meteorological training, using unregulated titles such as ''weather specialist'' or ''weatherman''. The [[American Meteorological Society]] and [[National Weather Association]] issue "Seals of Approval" to weather broadcasters who meet certain requirements but this is not mandatory to be hired by the media. [127] => [128] => ==Equipment== [129] => {{Main|Meteorological instrumentation}} [130] => [[File:Huracán Hugo.jpg|thumb|Satellite image of [[Hurricane Hugo]] with a [[polar low]] visible at the top of the image]] [131] => Each science has its own unique sets of laboratory equipment. In the atmosphere, there are many things or qualities of the atmosphere that can be measured. Rain, which can be observed, or seen anywhere and anytime was one of the first atmospheric qualities measured historically. Also, two other accurately measured qualities are wind and humidity. Neither of these can be seen but can be felt. The devices to measure these three sprang up in the mid-15th century and were respectively the [[rain gauge]], the anemometer, and the hygrometer. Many attempts had been made prior to the 15th century to construct adequate equipment to measure the many atmospheric variables. Many were faulty in some way or were simply not reliable. Even [[Aristotle]] noted this in some of his work as the difficulty to measure the air. [132] => [133] => Sets of surface measurements are important data to meteorologists. They give a snapshot of a variety of weather conditions at one single location and are usually at a [[weather station]], a ship or a [[weather buoy]]. The measurements taken at a weather station can include any number of atmospheric observables. Usually, temperature, [[atmospheric pressure|pressure]], wind measurements, and [[humidity]] are the variables that are measured by a thermometer, barometer, anemometer, and hygrometer, respectively.{{cite web|publisher=Office of the Federal Coordinator of Meteorology |website=ofcm.gov |url=http://www.ofcm.gov/fmh-1/fmh1.htm |title=Surface Weather Observations and Reports, Federal Meteorological Handbook No. 1 |date=September 2005 |archive-url=https://web.archive.org/web/19990420051036/http://www.ofcm.gov/fmh-1/fmh1.htm |archive-date=20 April 1999 |url-status=dead |access-date=2 January 2009}} Professional stations may also include air quality sensors ([[carbon monoxide]], [[carbon dioxide]], [[methane]], [[ozone]], [[dust]], and [[smoke]]), [[ceilometer]] (cloud ceiling), falling precipitation sensor, [[level sensor|flood sensor]], [[lightning|lightning sensor]], [[microphone]] ([[explosion]]s, [[sonic boom]]s, [[thunder]]), [[pyranometer]]/[[pyrheliometer]]/[[spectroradiometer]] (IR/Vis/UV [[photodiodes]]), [[rain gauge]]/[[snow gauge]], [[scintillation counter]] ([[background radiation]], [[fallout]], [[radon]]), [[seismometer]] ([[earthquake]]s and tremors), [[transmissometer]] (visibility), and a [[GPS clock]] for [[data logging]]. Upper air data are of crucial importance for weather forecasting. The most widely used technique is launches of [[radiosonde]]s. Supplementing the radiosondes a [[Aircraft Meteorological Data Relay|network of aircraft collection]] is organized by the [[World Meteorological Organization]]. [134] => [135] => [[Remote sensing]], as used in meteorology, is the concept of collecting data from remote weather events and subsequently producing weather information. The common types of remote sensing are [[Radar]], [[Lidar]], and [[satellite]]s (or [[photogrammetry]]). Each collects data about the atmosphere from a remote location and, usually, stores the data where the instrument is located. Radar and Lidar are not passive because both use [[EM radiation]] to illuminate a specific portion of the atmosphere.Peebles, Peyton, [1998], ''Radar Principles'', John Wiley & Sons, Inc., New York, {{ISBN|0-471-25205-0}}. Weather satellites along with more general-purpose Earth-observing satellites circling the earth at various altitudes have become an indispensable tool for studying a wide range of phenomena from forest fires to [[El Niño]]. [136] => [137] => ==Spatial scales== [138] => The study of the atmosphere can be divided into distinct areas that depend on both time and spatial scales. At one extreme of this scale is climatology. In the timescales of hours to days, meteorology separates into micro-, meso-, and synoptic scale meteorology. Respectively, the [[geospatial]] size of each of these three scales relates directly with the appropriate timescale. [139] => [140] => Other subclassifications are used to describe the unique, local, or broad effects within those subclasses. [141] => {| class="wikitable" style="border-spacing: 5px; margin:auto;" [142] => |+ '''Scales of Atmospheric Motion Systems'''{{Cite book|last=Holton|first=J.R.|title=An Introduction to Dynamic Meteorology|url=http://www.staff.science.uu.nl/~delde102/Holton_2004.pdf|edition=4th|publisher=Elsevier Academic Press|location=Burlington, MD|isbn=978-0-12-354015-7|year=2004|access-date=5 March 2016|page=5}}{{rp|page=5}} [143] => |- [144] => ! scope="col" style="width:150px;"| Type of motion [145] => ! scope="col" style="width:100px;"| Horizontal scale (meter) [146] => |- [147] => |- [148] => | Molecular mean free path || 10−7 [149] => |- [150] => | Minute turbulent eddies || 10−2 – 10−1 [151] => |- [152] => | Small eddies || 10−1 – 1 [153] => |- [154] => | Dust devils || 1–10 [155] => |- [156] => | Gusts || 10 – 102 [157] => |- [158] => | Tornadoes || 102 [159] => |- [160] => | Cumulonimbus clouds || 103 [161] => |- [162] => | Fronts, squall lines || 104 – 105 [163] => |- [164] => | Hurricanes || 105 [165] => |- [166] => | Synoptic Cyclones || 106 [167] => |- [168] => | Planetary waves || 107 [169] => |- [170] => |} [171] => [172] => ===Microscale=== [173] => {{Main|Microscale meteorology}} [174] => [175] => Microscale meteorology is the study of atmospheric phenomena on a scale of about {{convert|1|km|mi}} or less. Individual thunderstorms, clouds, and local turbulence caused by buildings and other obstacles (such as individual hills) are modeled on this scale.{{cite web |url=http://amsglossary.allenpress.com/glossary/search?query=micrometeorology |title=AMS Glossary of Meteorology |access-date=12 April 2008 |publisher=[[American Meteorological Society]] |url-status=dead |archive-url=https://web.archive.org/web/20110606101802/http://amsglossary.allenpress.com/glossary/search?query=micrometeorology |archive-date=6 June 2011 }} [176] => [177] => ===Mesoscale=== [178] => {{Main|Mesoscale meteorology}} [179] => [180] => Mesoscale meteorology is the study of atmospheric phenomena that has horizontal scales ranging from 1 km to 1000 km and a vertical scale that starts at the Earth's surface and includes the atmospheric boundary layer, troposphere, [[tropopause]], and the lower section of the [[stratosphere]]. Mesoscale timescales last from less than a day to multiple weeks. The events typically of interest are [[thunderstorm]]s, [[squall line]]s, [[weather front|fronts]], [[rainbands|precipitation bands]] in [[tropical cyclone|tropical]] and [[extratropical cyclone]]s, and topographically generated weather systems such as mountain waves and [[sea breeze|sea and land breezes]].''[http://amsglossary.allenpress.com/glossary Online Glossary of Meteorology]'', [[American Meteorological Society]] [http://www.ametsoc.org/], 2nd Ed., 2000, [http://www.allenpress.com Allen Press]. [181] => [182] => ===Synoptic scale=== [183] => {{Main|Synoptic scale meteorology}} [184] => [[File:Surface analysis.gif|thumb|upright=1.35|[[NOAA]]: Synoptic scale weather analysis]] [185] => [186] => Synoptic scale meteorology predicts atmospheric changes at scales up to 1000 km and 105 sec (28 days), in time and space. At the synoptic scale, the [[Coriolis acceleration]] acting on moving air masses (outside of the tropics) plays a dominant role in predictions. The phenomena typically described by [[synoptic meteorology]] include events such as extratropical cyclones, baroclinic troughs and ridges, [[weather front|frontal zones]], and to some extent [[jet stream]]s. All of these are typically given on [[weather map]]s for a specific time. The minimum horizontal scale of synoptic phenomena is limited to the spacing between [[weather station|surface observation stations]].Bluestein, H., ''Synoptic-Dynamic Meteorology in Midlatitudes: Principles of Kinematics and Dynamics, Vol. 1'', Oxford University Press, 1992; {{ISBN|0-19-506267-1}} [187] => [188] => ===Global scale=== [189] => [[File:WOA09 sea-surf TMP AYool.png|thumb|upright=1.35|Annual mean sea surface temperatures]] [190] => [191] => Global scale meteorology is the study of weather patterns related to the transport of heat from the [[tropics]] to the [[Geographical pole|poles]]. Very large scale oscillations are of importance at this scale. These oscillations have time periods typically on the order of months, such as the [[Madden–Julian oscillation]], or years, such as the [[El Niño–Southern Oscillation]] and the [[Pacific decadal oscillation]]. Global scale meteorology pushes into the range of climatology. The traditional definition of climate is pushed into larger timescales and with the understanding of the longer time scale global oscillations, their effect on climate and weather disturbances can be included in the synoptic and mesoscale timescales predictions. [192] => [193] => Numerical Weather Prediction is a main focus in understanding air–sea interaction, tropical meteorology, atmospheric predictability, and tropospheric/stratospheric processes.[http://www.nrlmry.navy.mil/sec7532.htm Global Modelling] {{Webarchive|url=https://web.archive.org/web/20070821003218/https://www1.nrlmry.navy.mil/sec7532.htm |date=21 August 2007 }}, US Naval Research Laboratory, Monterey, Ca. The [[Naval Research Laboratory]] in Monterey, California, developed a global atmospheric model called [[Navy Operational Global Atmospheric Prediction System]] (NOGAPS). NOGAPS is run operationally at [[Fleet Numerical Meteorology and Oceanography Center]] for the United States Military. Many other global atmospheric models are run by national meteorological agencies. [194] => [195] => ==Some meteorological principles== [196] => [197] => ===Boundary layer meteorology=== [198] => [[Boundary layer]] meteorology is the study of processes in the air layer directly above Earth's surface, known as the [[Planetary boundary layer|atmospheric boundary layer]] (ABL). The effects of the surface – heating, cooling, and [[friction]] – cause [[turbulence|turbulent mixing]] within the air layer. Significant movement of [[sensible heat|heat]], [[matter]], or [[momentum]] on time scales of less than a day are caused by turbulent motions.Garratt, J.R., ''The atmospheric boundary layer'', Cambridge University Press, 1992; {{ISBN|0-521-38052-9}}. Boundary layer meteorology includes the study of all types of surface–atmosphere boundary, including ocean, lake, urban land and non-urban land for the study of meteorology. [199] => [200] => ===Dynamic meteorology=== [201] => Dynamic meteorology generally focuses on the [[fluid dynamics]] of the atmosphere. The idea of ''[[air parcel]]'' is used to define the smallest element of the atmosphere, while ignoring the discrete molecular and chemical nature of the atmosphere. An air parcel is defined as an infinitesimal region in the fluid [[continuum (physics)|continuum]] of the atmosphere. The fundamental laws of fluid dynamics, thermodynamics, and motion are used to study the atmosphere. The physical quantities that characterize the state of the atmosphere are temperature, density, pressure, etc. These variables have unique values in the continuum. [202] => [203] => ==Applications== [204] => [205] => ===Weather forecasting=== [206] => {{Main|Weather forecasting}} [207] => [[File:Day5pressureforecast.png|thumb|upright=1.35|Forecast of surface pressures five days into the future for the north Pacific, North America, and north Atlantic Ocean]] [208] => [209] => Weather forecasting is the application of science and technology to predict the state of the [[Earth's atmosphere|atmosphere]] at a future time and given location. Humans have attempted to predict the weather informally for millennia and formally since at least the 19th century.{{cite web|website=Mistic House |url=http://www.mistichouse.com/astrology-lessons.htm |title=Astrology Lessons |access-date=12 January 2008 |archive-url=https://web.archive.org/web/20080608133837/http://www.mistichouse.com/astrology-lessons.htm |archive-date=8 June 2008 |url-status=dead}}{{cite web|first=Eric D. |last=Craft |url=http://eh.net/encyclopedia/article/craft.weather.forcasting.history|title=An Economic History of Weather Forecasting |date=7 October 2001 |website=EH.net |publisher=[[Economic History Association]] |archive-url=https://web.archive.org/web/20070503193324/http://eh.net/encyclopedia/article/craft.weather.forcasting.history |archive-date=3 May 2007 |url-status=dead |access-date=15 April 2007}} Weather forecasts are made by collecting quantitative [[data]] about the current state of the atmosphere and using scientific understanding of atmospheric processes to project how the atmosphere will evolve.{{cite web|url=http://earthobservatory.nasa.gov/Library/WxForecasting/wx2.html |title=Weather Forecasting Through the Ages |work=NASA |archive-url=https://web.archive.org/web/20050910210732/http://earthobservatory.nasa.gov/Library/WxForecasting/wx2.html |archive-date=10 September 2005 |url-status=dead |access-date=25 May 2008}} [210] => [211] => Once an all-human endeavor based mainly upon changes in [[Atmospheric pressure|barometric pressure]], current weather conditions, and sky condition,{{cite web|website=The Weather Doctor |url=http://www.islandnet.com/~see/weather/eyes/barometer3.htm |title=Applying The Barometer To Weather Watching |archive-url=https://web.archive.org/web/20080509105153/http://www.islandnet.com/~see/weather/eyes/barometer3.htm |archive-date=9 May 2008 |url-status=dead |access-date=25 May 2008}}{{cite web|first=Mark |last=Moore |date=2003 |url=http://www.nwac.us/education_resources/Field_forecasting.pdf |title=Field Forecasting—a short summary |work=[[Northwest Weather and Avalanche Center|NWAC]] |archive-url=https://web.archive.org/web/20090325034756/http://www.nwac.us/education_resources/Field_forecasting.pdf |archive-date=25 March 2009 |url-status=dead |access-date=25 May 2008}} [[numerical weather prediction|forecast models]] are now used to determine future conditions. Human input is still required to pick the best possible forecast model to base the forecast upon, which involves pattern recognition skills, [[teleconnection]]s, knowledge of model performance, and knowledge of model biases. The [[chaos theory|chaotic]] nature of the atmosphere, the massive computational power required to solve the equations that describe the atmosphere, error involved in measuring the initial conditions, and an incomplete understanding of atmospheric processes mean that forecasts become less accurate as the difference in current time and the time for which the forecast is being made (the ''range'' of the forecast) increases. The use of ensembles and model consensus help narrow the error and pick the most likely outcome.{{cite web|first1=Klaus |last1=Weickmann |first2=Jeff |last2=Whitaker |first3=Andres |last3=Roubicek |first4=Catherine |last4=Smith |url=http://www.cdc.noaa.gov/spotlight/12012001/ |title=The Use of Ensemble Forecasts to Produce Improved Medium Range (3–15 days) Weather Forecasts |publisher=[[Earth System Research Laboratories]] |website=cdc.noaa.gov |archive-url=https://web.archive.org/web/20071215055130/http://www.cdc.noaa.gov/spotlight/12012001/ |archive-date=15 December 2007 |url-status=dead |access-date=16 February 2007}}{{cite web|first=Todd |last=Kimberlain |url=http://www.wpc.ncep.noaa.gov/research/TropicalTalk.ppt |title=TC Genesis, Track, and Intensity Forecating [sic] |website=wpc.ncep.noaa.gov |date=June 2007 |access-date=21 July 2007}}Richard J. Pasch, Mike Fiorino, and [[Chris Landsea]]. [http://www.emc.ncep.noaa.gov/research/NCEP-EMCModelReview2006/TPC-NCEP2006.ppt TPC/NHC’S REVIEW OF THE NCEP PRODUCTION SUITE FOR 2006.]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }} Retrieved on 5 May 2008. [212] => [213] => There are a variety of end uses to weather forecasts. Weather warnings are important forecasts because they are used to protect life and property.{{cite web |url=http://www.weather.gov/mission.shtml |title=National Weather Service Mission Statement |website=weather.gov |publisher=[[National Oceanic and Atmospheric Administration|NOAA]] |archive-url=https://web.archive.org/web/20080612134118/http://www.weather.gov/mission.shtml |archive-date=12 June 2008 |url-status=dead |access-date=25 May 2008 }} Forecasts based on temperature and [[Precipitation (meteorology)|precipitation]] are important to agriculture,{{cite web|first=Blair |last=Fannin |url=http://southwestfarmpress.com/news/061406-Texas-weather/ |title=Dry weather conditions continue for Texas |date=14 June 2006 |work=Southwest Farm Press |archive-url=https://web.archive.org/web/20090703095038/http://southwestfarmpress.com/news/061406-Texas-weather/ |archive-date=3 July 2009 |url-status=dead |access-date=26 May 2008}}{{cite web|first=Terry |last=Mader |url=http://beef.unl.edu/stories/200004030.shtml |title=Drought Corn Silage |date=3 April 2000 |publisher=[[University of Nebraska–Lincoln]] |website=beef.unl.edu |archive-url=https://web.archive.org/web/20111005203246/http://beef.unl.edu/stories/200004030.shtml |archive-date=5 October 2011 |url-status=dead |access-date=26 May 2008}}{{cite web|first=Kathryn C. |last=Taylor |url=http://pubs.caes.uga.edu/caespubs/pubcd/C877.htm |title=Peach Orchard Establishment and Young Tree Care |date=March 2005 |publisher=[[University of Georgia]] |website=pubs.caes.uga.edu |archive-url=https://web.archive.org/web/20081224112403/http://pubs.caes.uga.edu/caespubs/pubcd/C877.htm |archive-date=24 December 2008 |url-status=dead |access-date=26 May 2008}}{{cite web|url=https://www.nytimes.com/1991/01/14/us/after-freeze-counting-losses-to-orange-crop.html |title=After Freeze, Counting Losses to Orange Crop |date=14 January 1991 |work=The New York Times |agency=[[Associated Press]] |access-date=26 May 2008 |archive-url=https://web.archive.org/web/20180615190918/https://www.nytimes.com/1991/01/14/us/after-freeze-counting-losses-to-orange-crop.html |archive-date=15 June 2018 |url-status=live}} and therefore to commodity traders within stock markets. Temperature forecasts are used by utility companies to estimate demand over coming days.{{cite web|work=The New York Times |agency=[[Reuters]] |url=https://www.nytimes.com/1993/02/26/business/futures-options-cold-weather-brings-surge-in-prices-of-heating-fuels.html |title=FUTURES/OPTIONS; Cold Weather Brings Surge In Prices of Heating Fuels |date=26 February 1993 |access-date=25 May 2008 |archive-url=https://web.archive.org/web/20180615135320/https://www.nytimes.com/1993/02/26/business/futures-options-cold-weather-brings-surge-in-prices-of-heating-fuels.html |archive-date=15 June 2018 |url-status=live}}{{cite web|url=http://news.bbc.co.uk/1/hi/uk/5212724.stm |title=Heatwave causes electricity surge |work=BBC News |date=25 July 2006 |access-date=25 May 2008 |archive-url=https://web.archive.org/web/20090520060913/http://news.bbc.co.uk/1/hi/uk/5212724.stm |archive-date=20 May 2009 |url-status=live}}{{cite web|url=http://www.tcdsb.org/environment/energydrill/EDSP_KeyMessages_FINAL.pdf |title=The seven key messages of the Energy Drill program |website=tcdsb.org/environment/energydrill |publisher=[[Toronto Catholic District School Board]] |archive-url=https://web.archive.org/web/20120217042744/http://www.tcdsb.org/environment/energydrill/EDSP_KeyMessages_FINAL.pdf |archive-date=17 February 2012 |url-status=dead |access-date=25 May 2008}} On an everyday basis, people use weather forecasts to determine what to wear. Since outdoor activities are severely curtailed by heavy rain, snow, and [[wind chill]], forecasts can be used to plan activities around these events, and to plan ahead and survive them. [214] => [215] => ===Aviation meteorology=== [216] => Aviation meteorology deals with the impact of weather on [[air traffic control|air traffic management]].{{cite book |title=A Dictionary of Aviation |first=David W. |last=Wragg |isbn=9780850451634 |edition=first |publisher=Osprey |year=1973 |page=190}} It is important for air crews to understand the implications of weather on their flight plan as well as their aircraft, as noted by the ''[[Aeronautical Information Manual]]'':An international version called the [[Aeronautical Information Publication]] contains parallel information, as well as specific information on the international airports for use by the international community. [217] =>
The effects of ice on aircraft are cumulative—thrust is reduced, drag increases, lift lessens, and weight increases. The results are an increase in stall speed and a deterioration of aircraft performance. In extreme cases, 2 to 3 inches of ice can form on the leading edge of the airfoil in less than 5 minutes. It takes but 1/2 inch of ice to reduce the lifting power of some aircraft by 50 percent and increases the frictional drag by an equal percentage.{{cite web|url=https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap7_section_1.html |publisher=[[Federal Aviation Administration]], Dept. of Transportation |title=Aeronautical Information Manual, Section 1. Meteorology: 7-1-21. PIREPs Relating to Airframe Icing |date=2020-07-16 |access-date=2020-08-17 |website=AIM Online}}
[218] => [219] => ===Agricultural meteorology=== [220] => Meteorologists, [[soil science|soil scientists]], agricultural hydrologists, and [[agronomy|agronomists]] are people concerned with studying the effects of weather and climate on plant distribution, [[crop yield]], water-use efficiency, [[phenology]] of plant and animal development, and the energy balance of managed and natural ecosystems. Conversely, they are interested in the role of vegetation on climate and weather.[http://www.elsevier.com/wps/find/journaldescription.cws_home/503295/description?navopenmenu=-2 Agricultural and Forest Meteorology], Elsevier, {{ISSN|0168-1923}}. [221] => [222] => ===Hydrometeorology=== [223] => [[Hydrometeorology]] is the branch of meteorology that deals with the [[hydrologic cycle]], the water budget, and the rainfall statistics of [[storm]]s.[https://www.britannica.com/eb/article-9041744/hydrometeorology Encyclopædia Britannica], 2007. A hydrometeorologist prepares and issues forecasts of accumulating (quantitative) precipitation, heavy rain, heavy snow, and highlights areas with the potential for flash flooding. Typically the range of knowledge that is required overlaps with climatology, mesoscale and synoptic meteorology, and other geosciences.[http://www.wpc.ncep.noaa.gov/html/about2.shtml About the HPC], NOAA/ National Weather Service, National Centers for Environmental Prediction, [http://www.wpc.ncep.noaa.gov/ Hydrometeorological Prediction Center], Camp Springs, Maryland, 2007. [224] => [225] => The multidisciplinary nature of the branch can result in technical challenges, since tools and solutions from each of the individual disciplines involved may behave slightly differently, be optimized for different hard- and software platforms and use different data formats. There are some initiatives – such as the DRIHM project{{cite web|url=http://www.drihm.eu/|title=Home|access-date=16 June 2015|archive-date=6 August 2015|archive-url=https://web.archive.org/web/20150806054006/http://www.drihm.eu/|url-status=dead}} – that are trying to address this issue.[http://www.drihm.eu/images/newsletter/newsletter%20drihm%2001.pdf DRIHM News, number 1, March 2012, p2] {{Webarchive|url=https://web.archive.org/web/20150904002931/http://www.drihm.eu/images/newsletter/newsletter%20drihm%2001.pdf |date=4 September 2015 }} "An ideal environment for hydro-meteorology research at the European level" [226] => [227] => ===Nuclear meteorology=== [228] => Nuclear meteorology investigates the distribution of [[radioactive]] [[aerosol]]s and [[gas]]es in the atmosphere.{{cite journal [229] => |title=Modern research in nuclear meteorology [230] => |date=February 1974 [231] => |journal=Atomic Energy [232] => |volume=36 [233] => |issue=2 [234] => |pages=197–198 [235] => |doi=10.1007/BF01117823|last1=Tsitskishvili [236] => |first1=M. S. [237] => |last2=Trusov [238] => |first2=A. G. [239] => |s2cid=96128061 [240] => }} [241] => [242] => ===Maritime meteorology=== [243] => Maritime meteorology deals with air and wave forecasts for ships operating at sea. Organizations such as the [[Ocean Prediction Center]], Honolulu [[National Weather Service]] forecast office, United Kingdom [[Met Office]], [[Royal Netherlands Meteorological Institute|KNMI]] and [[Japan Meteorological Agency|JMA]] prepare high seas forecasts for the world's oceans. [244] => [245] => ===Military meteorology=== [246] => {{Main|Military meteorology}} [247] => [248] => Military meteorology is the research and application of meteorology for [[military]] purposes. In the United States, the [[United States Navy]]'s [[Commander, Naval Meteorology and Oceanography Command]] oversees meteorological efforts for the Navy and [[United States Marine Corps|Marine Corps]] while the [[United States Air Force]]'s [[Air Force Weather Agency]] is responsible for the Air Force and [[United States Army|Army]]. [249] => [250] => ===Environmental meteorology=== [251] => Environmental meteorology mainly analyzes industrial pollution dispersion physically and chemically based on meteorological parameters such as temperature, humidity, wind, and various weather conditions. [252] => [253] => ===Renewable energy=== [254] => Meteorology applications in renewable energy includes basic research, "exploration," and potential mapping of wind power and solar radiation for wind and solar energy. [255] => [256] => ==See also== [257] => {{Main|Outline of meteorology|Glossary of meteorology}} [258] => {{Columns-list|colwidth=30em| [259] => *[[Aerography (meteorology)|Aerography]] [260] => *[[American Practical Navigator]] [261] => *[[Atmospheric circulation]] [262] => *[[Atmospheric layers]] [263] => *[[Atmospheric models]] [264] => * [[Atmospheric pressure]] [265] => *[[Atmospheric thermodynamics]] [266] => *[[Automated airport weather station]] [267] => *[[Cloud]] [268] => *[[Eddy covariance]] flux (eddy correlation, eddy flux) [269] => *[[El Niño–Southern Oscillation]] [270] => *[[Index of meteorology articles]] [271] => *[[Indigenous Australian seasons]] [272] => *[[List of cloud types]] [273] => *[[List of meteorology institutions]] [274] => *[[List of Russian meteorologists]] [275] => *[[List of weather instruments]] [276] => *[[Madden–Julian oscillation]] [277] => *[[Meteorological winter]] [278] => *[[National Weatherperson's Day]] [279] => *[[Precipitation]] [280] => *[[ROFOR]] [281] => *[[Space weather]] [282] => *[[Walker circulation]] [283] => *[[Weather station]] [284] => }} [285] => [286] => ==References== [287] => {{Reflist}} [288] => [289] => ==Further reading== [290] => [291] => *Byers, Horace. General Meteorology. New York: McGraw-Hill, 1994. [292] => *{{Cite book [293] => |last=Garret [294] => |first=J.R. [295] => |title=The atmospheric boundary layer [296] => |publisher=Cambridge University Press [297] => |isbn=978-0-521-38052-2 [298] => |year=1992 [299] => |orig-year=1992 [300] => |url-access=registration [301] => |url=https://archive.org/details/atmosphericbound0000garr [302] => }} [303] => *{{Cite book [304] => |others=American Meteorological Society [305] => |title=Glossary of Meteorology [306] => |url=http://amsglossary.allenpress.com/glossary [307] => |edition=2nd [308] => |publisher=Allen Press [309] => |year=2000}} [310] => *{{Cite book [311] => |last=Bluestein [312] => |first=H [313] => |title=Synoptic-Dynamic Meteorology in Midlatitudes: Principles of Kinematics and Dynamics, Vol. 1 [314] => |publisher=[[Oxford University Press]] [315] => |isbn=978-0-19-506267-0 [316] => |year=1992 [317] => |orig-year=1992}} [318] => *{{Cite book [319] => |last=Bluestein [320] => |first=H [321] => |title=Synoptic-Dynamic Meteorology in Midlatitudes: Volume II: Observations and Theory of Weather Systems [322] => |publisher=Oxford University Press [323] => |isbn=978-0-19-506268-7 [324] => |year=1993 [325] => |orig-year=1993}} [326] => *{{Cite book [327] => |last=Reynolds [328] => |first=R [329] => |title=Guide to Weather [330] => |publisher=Firefly Books Inc [331] => |location=Buffalo, New York [332] => |isbn=978-1-55407-110-4 [333] => |page=[https://archive.org/details/isbn_9781554071104/page/208 208] [334] => |year=2005 [335] => |orig-year=2005 [336] => |url=https://archive.org/details/isbn_9781554071104/page/208 [337] => }} [338] => *{{Cite book [339] => |last = Holton [340] => |first = J.R. [341] => |title = An Introduction to Dynamic Meteorology [342] => |url = http://elsevier.com.uk [343] => |edition = 4th [344] => |publisher = Elsevier Inc. [345] => |location = Burlington, Md [346] => |isbn = 978-0-12-354015-7 [347] => |year = 2004 [348] => |orig-year = 2004 [349] => |access-date = 21 May 2017 [350] => |archive-url = https://web.archive.org/web/20130719153537/http://elsevier.com.uk/ [351] => |archive-date = 19 July 2013 [352] => |url-status = dead [353] => }} [354] => * {{cite book |author1=Roulstone, Ian |author2=Norbury, John |name-list-style=amp |title=Invisible in the Storm: the role of mathematics in understanding weather |url=https://books.google.com/books?id=qnMrFEHMrWwC|year=2013 |publisher=Princeton University Press|isbn=978-0691152721 }} [355] => [356] => ===Dictionaries and encyclopedias=== [357] => * {{cite book|first1=Todd S.|last1=Glickman|location=Cambridge, Massachusetts|date=June 2000|url=http://glossary.ametsoc.org/?p=1&query=doldrums |title=Meteorology Glossary|format=electronic|edition=2nd|publisher=[[American Meteorological Society]]}} [358] => * {{cite book |first1=Roberto |last1=Gustavo Herrera |first2=Ricardo |last2=García-Herrera |first3=Luis |last3=Prieto |first4=David |last4=Gallego |first5=Emiliano |last5=Hernández |first6=Luis |last6=Gimeno |first7=Gunther |last7=Können |first8=Frits |last8=Koek |first9=Dennis |last9=Wheeler |first10=Clive |last10=Wilkinson |first11=Maria |last11=Del Rosario Prieto |first12=Carlos |last12=Báez |first13=Scott |last13=Woodruff |url=http://pendientedemigracion.ucm.es/info/cliwoc/Dictionary_text.pdf |title=A Dictionary of Nautical Meteorological Terms: CLIWOC Multilingual Dictionary of Meteorological Terms; An English/Spanish/French/Dutch Dictionary of Windforce Terms Used by Mariners from 1750 to 1850 |publisher=[[CLIWOC]] |access-date=13 April 2014 |archive-date=21 April 2021 |archive-url=https://web.archive.org/web/20210421055113/http://webs.ucm.es/info/cliwoc/Dictionary_text.pdf |url-status=dead }} [359] => * {{cite web |url=http://www.cwb.gov.tw/V7e/knowledge/encyclopedia/me000.htm |title=Meteorology Encyclopedia |publisher=Central Weather Bureau |date=6 December 2018 |access-date=14 September 2014 |archive-url=https://web.archive.org/web/20140921144259/http://www.cwb.gov.tw/V7e/knowledge/encyclopedia/me000.htm |archive-date=21 September 2014 |url-status=dead }} [360] => [361] => ===History=== [362] => * {{cite book|last1=Lawrence-Mathers|first1=Anne|date=2020|title=Medieval Meteorology: Forecasting the Weather from Aristotle to the Almanac|location=Cambridge|publisher=Cambridge University Press|isbn=978-1-108-40600-0|doi=10.1017/9781108289948|bibcode=2020mmfw.book.....L |s2cid=211658964 }} [363] => [364] => ==External links== [365] => {{commons category|Meteorology}} [366] => {{Wikisource portal|Meteorology}} [367] => {{Wikiversity|Meteorology}} [368] => [369] => ''Please see [[weather forecasting]] for weather forecast sites.'' [370] => *[http://www.shodor.org/metweb/ Air Quality Meteorology] – Online course that introduces the basic concepts of meteorology and air quality necessary to understand meteorological computer models. Written at a bachelor's degree level. [371] => *[https://www.globe.gov/home The GLOBE Program] – (Global Learning and Observations to Benefit the Environment) An international environmental science and education program that links students, teachers, and the scientific research community in an effort to learn more about the environment through student data collection and observation. [372] => *[https://glossary.ametsoc.org/wiki/Welcome Glossary of Meteorology] – From the American Meteorological Society, an excellent reference of nomenclature, equations, and concepts for the more advanced reader. [373] => *[https://www.weather.gov/jetstream/ JetStream – An Online School for Weather] – National Weather Service [374] => *[http://www.bom.gov.au/lam/ Learn About Meteorology] – Australian Bureau of Meteorology [375] => *[http://weather.about.com The Weather Guide] {{Webarchive|url=https://web.archive.org/web/20170224000722/http://weather.about.com/ |date=24 February 2017 }} – Weather Tutorials and News at About.com [376] => *[https://www.meted.ucar.edu/index.php Meteorology Education and Training (MetEd)] – The COMET Program [377] => *[https://web.archive.org/web/20060712090225/http://www.lib.noaa.gov/ NOAA Central Library] – National Oceanic & Atmospheric Administration [378] => *[http://ww2010.atmos.uiuc.edu The World Weather 2010 Project] {{Webarchive|url=https://web.archive.org/web/20080819203902/http://ww2010.atmos.uiuc.edu/ |date=19 August 2008 }} The University of Illinois at Urbana–Champaign [379] => *[http://www.ogimet.com/index.phtml.en Ogimet – online data from meteorological stations of the world, obtained through NOAA free services] [380] => *[https://web.archive.org/web/20180619181214/https://www.archives.ucar.edu/ National Center for Atmospheric Research Archives, documents the history of meteorology] [381] => *[http://www.metoffice.gov.uk/learning/science Weather forecasting and Climate science] – United Kingdom Meteorological Office [382] => * [http://www.bbc.co.uk/programmes/p00548v8 Meteorology], BBC Radio 4 discussion with Vladimir Janković, Richard Hambyn and Iba Taub (''In Our Time'', 6 March 2003) [383] => * [https://bibnum.obspm.fr/exhibits/show/temps/temps_introduction Virtual exhibition about meteorology] on the digital library of [[Paris Observatory]] [384] => [385] => {{Navboxes [386] => |list = [387] => {{Meteorological variables}} [388] => {{Meteorological equipment}} [389] => {{Physical geography topics}} [390] => {{Earth-based meteorological observation}} [391] => {{Nature}} }} [392] => {{Portal bar|Weather}} [393] => {{Authority control}} [394] => [395] => [[Category:Meteorology| ]] [396] => [[Category:Applied and interdisciplinary physics]] [397] => [[Category:Oceanography]] [398] => [[Category:Physical geography]] [399] => [[Category:Greek words and phrases]] [] => )
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Meteorology

Meteorology is the scientific study of the atmosphere, weather, and climate. It encompasses a wide range of topics, including the causes and dynamics of weather patterns, the measurement and prediction of atmospheric conditions, and the impact of weather and climate on human activities and the environment.

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It encompasses a wide range of topics, including the causes and dynamics of weather patterns, the measurement and prediction of atmospheric conditions, and the impact of weather and climate on human activities and the environment. Meteorologists use a variety of tools and techniques, such as weather satellites, radar systems, and computer models, to observe and analyze atmospheric phenomena. The field of meteorology has evolved significantly over time, from early observations and forecasting techniques to modern-day advancements in technology and our understanding of the Earth's atmosphere. Weather forecasts, severe weather warnings, and climate predictions are some of the practical applications of meteorology that affect our daily lives. Overall, meteorology plays a crucial role in helping us understand and predict weather patterns, climate change, and their impacts on the world around us.

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