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{{Short description|Tropical cyclones that develop in the Northwest Pacific Ocean}} | |||
'''Bold text'''{{about|Pacific tropical cyclones|other uses|Typhoon (disambiguation)}} | |||
{{Hatnote group| | |||
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{{Distinguish|Typhon|Typhoo}} | |||
{{About|the type of tropical cyclones||Typhoon (disambiguation)}} | |||
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A '''Typhoon''' is a mature ] that develops in the western part of the ] between ] and ]. This region is referred to as the northwest Pacific basin.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|author=]|publisher=]|accessdate=2011-03-30|date=2010-06-01|title=Subject: F1) What regions around the globe have tropical cyclones and who is responsible for forecasting there?}}</ref> For organisational purposes, the northern Pacific Ocean is divided into three regions: the eastern (North America to ]), central (140°W to 180°), and western (180° to 100°E). The ] (RSMC) for tropical cyclone forecasts is in ], with other tropical cyclone warning centers for the northwest Pacific in ] (the ]), the ] and ]. While the RSMC names each system, the main name list itself is coordinated amongst 18 countries that have territories threatened by typhoons each year. The Philippines use their own naming list for systems which approach the country. | |||
], ], and ]). The cyclones on the lower and upper right are typhoons.|alt=]] | |||
A '''typhoon''' is a ] that develops between ] and ] in the ] and which produces sustained hurricane-force winds of at least {{convert|119|km/h|mph|abbr=on}}.<ref>{{cite web|title=Typhoon|url=http://glossary.ametsoc.org/Typhoon|work=Glossary of Meteorology|date=2012|access-date=2015-04-05|publisher=]|archive-date=2015-04-12|archive-url=https://web.archive.org/web/20150412011727/http://glossary.ametsoc.org/Typhoon|url-status=live}}</ref> This region is referred to as the ],<ref>{{cite journal|url=http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|author=Chris Landsea|access-date=2011-03-30|date=2010-06-01|title=Subject: F1) What regions around the globe have tropical cyclones and who is responsible for forecasting there?|journal=Journal of Geophysical Research: Atmospheres|pages=D06108|author-link=Chris Landsea|archive-date=2012-07-31|archive-url=https://web.archive.org/web/20120731202710/http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|url-status=live}}</ref> accounting for almost one third of the world's tropical cyclones. The term ''hurricane'' refers to a tropical cyclone (again with sustained winds of at least {{convert|119|km/h|mph|abbr=on}}) in the north central and northeast Pacific, and the north Atlantic.<ref>{{cite web|title=Hurricane|url=http://glossary.ametsoc.org/Hurricane|work=Glossary of Meteorology|date=2012|access-date=2015-04-05|publisher=]|archive-date=2015-04-05|archive-url=https://web.archive.org/web/20150405092036/http://glossary.ametsoc.org/Hurricane|url-status=live}}</ref> In all of the preceding regions, weaker tropical cyclones are called ''tropical storms''. For organizational purposes, the northern ] is divided into three regions: the eastern (North America to ]), central (140°W to 180°), and western (180° to 100°E). The ] (RSMC) for tropical cyclone forecasts is in ], with other tropical cyclone warning centres for the northwest Pacific in ] (the ]), the ], and ]. Although the RSMC names each system, the main name list itself is coordinated among 18 countries that have territories threatened by typhoons each year.<ref name="HCT">{{cite web | title = What is the difference between a hurricane, a cyclone, and a typhoon? | work = OCEAN FACTS | publisher = ] | url = http://oceanservice.noaa.gov/facts/cyclone.html | access-date = 2016-12-24 | archive-date = 2016-12-25 | archive-url = https://web.archive.org/web/20161225071725/http://oceanservice.noaa.gov/facts/cyclone.html | url-status = live }}</ref> | |||
Within the northwestern Pacific there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are six main requirements for typhoon formation and development: sufficiently warm ]s, atmospheric instability, high ] in the lower to middle levels of the troposphere, enough ] to develop a ], a pre-existing low level focus or disturbance, and low vertical ]. The majority of storms form between June and November whilst tropical cyclone formation is at a minimum between December and May. On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the ] towards the west or northwest, with some systems recurving near and east of ]. The Philippines receive the brunt of the landfalls, with ] and Japan being impacted slightly less. Some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand year sample via documents within their archives. ] has received the wettest known typhoon on record for the ]. | |||
Within most of the northwestern Pacific, there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are several main requirements for typhoon formation and development. It must be in sufficiently warm ]s, atmospheric instability, high ] in the lower-to-middle levels of the ], have enough ] to develop a ], a pre-existing low level focus or disturbance, and a low vertical ]. Although the majority of storms form between June and November, a few storms may occur between December and May (although tropical cyclone formation is very rare during that time). On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the ] towards the west or northwest, with some systems recurving near and east of ]. The Philippines receive the brunt of the landfalls, with ] and Japan being less often impacted. However, some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand-year sample via documents within their archives. ] has received the wettest known typhoon on record for the northwest Pacific ]s. However, Vietnam recognises its typhoon season as lasting from the beginning of June through to the end of November, with an average of four to six typhoons hitting the country annually.<ref>{{Cite web|date=2019-10-29|title=Typhoon and Tropical Cyclone Seasons in Vietnam|url=https://vn.usembassy.gov/typhoon-and-tropical-cyclone-seasons-in-vietnam/|access-date=2022-01-07|website=U.S. Embassy & Consulate in Vietnam|language=en-US|archive-date=2022-01-07|archive-url=https://web.archive.org/web/20220107033323/https://vn.usembassy.gov/typhoon-and-tropical-cyclone-seasons-in-vietnam/|url-status=live}}</ref><ref>{{Cite web|last=Briefing|first=Vietnam|date=2021-09-15|title=Typhoon Season in Vietnam: How to Prepare Your Business|url=https://www.vietnam-briefing.com/news/typhoon-season-vietnam-how-to-prepare-your-business.html/|access-date=2022-01-07|website=Vietnam Briefing News|language=en|archive-date=2021-12-16|archive-url=https://web.archive.org/web/20211216070109/https://www.vietnam-briefing.com/news/typhoon-season-vietnam-how-to-prepare-your-business.html/|url-status=live}}</ref> | |||
According to the statistics of the Joint Typhoon Warning Center, from 1950 to 2022, the Northwest Pacific generated an average of 26.5 named tropical cyclones each year, of which an average of 16.6 reached typhoon standard or above as defined by the Joint Typhoon Warning Center.<ref>{{Cite web |title=Northwest Pacific Ocean Historical Tropical Cyclone Statistics |url=http://tropical.atmos.colostate.edu/Realtime/index.php?arch&loc=northwestpacific |website=Colorado State University}}</ref> | |||
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<ref name="AOML">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=Atlantic Oceanographic and Meteorological Laboratory| |
<ref name="AOML">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=Atlantic Oceanographic and Meteorological Laboratory|access-date=2009-10-19}}</ref> | ||
<ref name="BOM">{{cite web|url=http://www.cawcr.gov.au/bmrc/pubs/tcguide/globa_guide_intro.htm|title=Global Guide to Tropical Cyclone Forecasting| |
<ref name="BOM">{{cite web|url=http://www.cawcr.gov.au/bmrc/pubs/tcguide/globa_guide_intro.htm|title=Global Guide to Tropical Cyclone Forecasting|access-date=2009-10-19 | work = (Holland 1993). # Holland, G.J. (1993): "Ready Reckoner" – Chapter 9, Global Guide to Tropical Cyclone Forecasting, WMO/TC-No. 560, Report No. TCP-31, World Meteorological Organization; Geneva, Switzerland }}</ref> | ||
<ref name ="AOML">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=Atlantic Oceanographic and Meteorological Laboratory| |
<ref name ="AOML">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=Atlantic Oceanographic and Meteorological Laboratory|access-date=2009-10-19 | work=FAQ: What is a hurricane, typhoon, or tropical cyclone?}}</ref> | ||
<ref name="TyphoonBasic"/> | |||
<ref name="TyphoonBasic">{{cite news|url=http://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|accessdate=2008-08-18|work=USA Today|date=2007-11-01}}</ref> | |||
<ref name="FAQ: Hurricanes, Typhoons, and Tropical Cyclones">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=FAQ: Hurricanes, Typhoons, and Tropical Cyclones| |
<ref name="FAQ: Hurricanes, Typhoons, and Tropical Cyclones">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=FAQ: Hurricanes, Typhoons, and Tropical Cyclones|access-date=2009-08-10|work=Atlantic Oceanographic and Meteorological Laboratory}}</ref> | ||
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==Nomenclature== | == Nomenclature == | ||
=== Etymology === | |||
The etymology of typhoon is either Chinese or ] origin. | |||
Typhoon may trace to {{lang|zh|風癡}} (meaning "winds which long last"), first attested in 1124 in China. It was pronounced as {{IPA|nan-TW|hɔŋ tsʰi|}} in ] at the time, but later evolved to . New characters {{lang|zh|風颱}} were created to match the sound, no later than 1566.<ref name="Li 1990"/><ref name="attest date">{{cite book|date=280|title=三國志·吳書|trans-title=] – Book of Wu|chapter=陸凱傳|editor-last=Chen|editor-first=Shou|quote=蒼梧、南海,歲有舊風瘴氣之害,風則折木,飛沙轉石}}; {{cite book|title=宣和奉使高麗圖經|trans-title=The trip of the Imperial envoy to Korea, with illustrations|last=徐兢|date=1124|quote=海道之難甚矣...又惡三種險:曰癡風,曰黑風,曰海動。癡風之作,連日怒號不止,四方莫辨}}; {{cite book|title=荔鏡記|trans-title=]|date=1566|quote=風台過了,今即會南}}. As cited in {{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}</ref> The word was introduced to ] in the inverted Mandarin order {{lang|zh|颱風}} {{IPA|cmn|tʰaɪ fɤŋ|}}, later picked up by foreign sailors to appear as typhoon.<ref name="Li 1990">{{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字 |last=李荣|editor=冯爱珍|date=2006|journal=科技术语研究(季刊)|issue=4|volume=8|url=http://www.term.org.cn/CN/PDF/10948?token=7ea825541ba2405ca4e592c820de03bf}}</ref> The usage of {{lang|zh|颱風}} was not dominant until ], the head of meteorology of the ] from 1929 to 1936, declared it to be the standard term.<ref name="Fu 2023"/><ref name="Wu 2020"/> There were 29 alternative terms for typhoon recorded in a chronicle in 1762, now mostly replaced by {{lang|zh|颱風}},<ref>The ''] Chronicle'' 潮州府志 (1762) recorded 29 expressions for typhoon, including {{lang|zh|回南風, 落西風, 蕩西風, 奔龍 and 鐵風篩.}} As cited in {{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}</ref> although {{lang|zh|風癡}} or {{lang|zh|風颱}} continues to be used in ]- and ]- speaking areas from ], Guangdong to ], Zhejiang.<ref name="Li 1990"/> | |||
===Etymology and usage=== | |||
There are many theories of the origin of the English word ''typhoon''. It possibly originated from a ] word (台風, pronounced ''taifū''). It could have originated from ] توفان ''tūfān'' (storm), (which is pronounced "tufoon" in the Bandari dialect of Persian, spoken on the shores of the ]<ref></ref> from the verb ''tūfīdan'' ({{lang-fa|توفیدن/طوفیدن}} means "to roar", "to blow furiously")<ref></ref> - a cyclonic storm, a ] of Sanskrit "tanun" meaning high or agitated winds. It also appears to have contributed to the Chinese word 大風 ({{zh|p=dàfēng}}) meaning "great wind" as spoken in southern Chinese dialects such as ] and ] (In Guangzhou Cantonese, for example, it is pronounced as daai6fung1). The modern way of writing ''typhoon'' in ] ({{zh|t=颱風|zh|s=台风|p=táifēng}}) uses a different first character, however, and may have come about based on the re-importing of the word from English. There is also written records that say "tai" is a native Chinese word (or a word used in the Taiwan island) meaning "very, very strong wind (often lasts for days and occurs largely in summers)".<ref></ref> Another theory is that the initial ''ty'' syllable of the word was a reference to Taiwan, and ''phoon'' is pronounced like winds in Taiwanese language. Therefore, ''typhoon'' may refer to Taiwan's winds. Another possible etymology of ''typhoon'' is from the ] word τύφειν (týphein), meaning "to smoke" (see also ]), to describe the ] storms of the ].<ref>{{cite book|url=http://books.google.com/?id=sMiRc-JFIfMC&pg=PA141&lpg=PA141&dq=typhoon+greek+arab+origin+book#v=onepage&q&f=false|pages=141–142|author=Anatoly Liberman|title=Word Origins And How We Know Them: Etymology for Everyone|year=2009|publisher=Oxford University Press|accessdate=2011-03-06|isbn=978-0-19-538707-0}}</ref> ''Typhoon'' is the regional name in the northwest Pacific for a severe (or mature) ],<ref>{{cite web|title=Typhoon|url=http://amsglossary.allenpress.com/glossary/search?id=typhoon1|author=Glossary of Meteorology|date=June 2000|accessdate=2011-03-24|publisher=]}}</ref> whereas ''hurricane'' is the regional term in the northeast Pacific and northern Atlantic. Elsewhere this is called a ''tropical cyclone'', ''severe tropical cyclone'', or ''severe cyclonic storm''.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|date=2010-06-01|accessdate=2011-03-24|title=Frequently Asked Questions Subject: A1) What is a hurricane, typhoon, or tropical cyclone?|author=]|publisher=]}}</ref> | |||
Some English linguists proposed the English word typhoon traced to the Cantonese pronunciation of {{lang|zh|颱風}} {{IPA|yue|tʰɔi fuŋ|}} (correspond to Mandarin {{IPA|cmn|tʰaɪ fɤŋ|}}), in turn the Cantonese word traced to Arabic.<ref>{{Cite book|author1=Garland Hampton Cannon|author2=Alan S. Kaye|url=https://books.google.com/books?id=MiNWi1g3fJ4C&dq=typhoon+special&pg=PA74|title=The Arabic Contributions to the English Language: An Historical Dictionary|date=1994|publisher=Otto Harrassowitz Verlag|isbn=978-3-447-03491-3|pages=74|language=en|quote=''Typhoon'' is a special case, transmitted by Cantonese, from Arabic, but ultimately deriving from Greek.|access-date=2021-12-05|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112032/https://books.google.com/books?id=MiNWi1g3fJ4C&dq=typhoon+special&pg=PA74|url-status=live}}</ref> This claim contradicts the fact that the Cantonese term for typhoon was {{lang|zh|風舊}} {{IPA|yue|fuŋ kɐu|}} before the national promotion of {{lang|zh|颱風}}.<ref name="Li 1990"/> {{lang|zh|風舊}} (meaning "winds which long last") was first attested in 280, being the oldest Chinese term for typhoon.<ref name="attest date"/> Not one Chinese historical record links {{lang|zh|颱風}} to an Arabic or foreign origin.<ref name="Fu 2023"/><ref name="Wu 2020"/> On the other hand, Chinese records consistently assert foreigners refer typhoon as "black wind".<ref name="Fu 2023"/><ref name="Wu 2020"/> "Black wind" eventually enters the vocabulary of ] as {{lang|zh|黑老風}} {{IPA|cjy|xəʔ lo fəŋ|}}.<ref name="Wubu 2020">{{cite book|title=陕西方言集成:榆林卷|editor-last=王建领|last=贺雪梅|chapter=吴堡县篇|publisher=商务印书馆|date=2020|pages=692–726}}</ref> | |||
===Intensity classifications=== | |||
Alternatively, some dictionaries propose that typhoon derived from (طوفان) ''tūfān'', meaning storm in ] and ].<ref name="1966 oed">{{cite encyclopedia|encyclopedia=The Oxford Dictionary of English Etymology|editor-last=Onions|editor-first=C. T.|page=965|title=Typhoon|publisher=Oxford University Press|year=1966|quote=typhoon. cyclonic storm in the China seas. XVI . Adoption of Chinese ''tai fung'', dialect variant of ''ta'' big, ''feng'' wind; confer German ''taifun'', ''teifun'', French ''typhon''. Earlier † ''tuffoon'' (XVII), identified in form with † ''touffon'' (XVI), † ''tuffon'' (XVII) violent storm in India, adoption of Portuguese ''tufão'', adoption of Hindustani (in turn, adoption of Arabic) ''ṭūfān'' hurricane, tornado, beside which there was a contemporary † typhon (XVI), adoption of Latin ''tȳphōn'', adoption of Greek ''tuphôn'', related to ''tūphein'' (see TYPHUS).}}</ref><ref name="online">{{cite web|url=http://www.etymonline.com/index.php?term=typhoon|work=Online Etymology Dictionary|title=typhoon {{!}} Origin and meaning of typhoon by Online Etymology Dictionary|access-date=2008-10-26|archive-date=2014-01-25|archive-url=https://web.archive.org/web/20140125091024/http://www.etymonline.com/index.php?term=typhoon|url-status=live}}</ref> The ] of (طوفان) ''tūfān'' possibly traces to the Ancient Greek mythological creature '']''.<ref name="online"/> In ] ''typhon'' was attested as storm in 1504.<ref>{{Cite web|url=https://www.cnrtl.fr/definition/typhon|title=TYPHON : Définition de TYPHON|language=fr|access-date=2019-08-19|archive-date=2020-08-09|archive-url=https://web.archive.org/web/20200809125523/https://www.cnrtl.fr/definition/typhon|url-status=live}}</ref> Portuguese traveler ] referred to a ''tufão'' in his memoir published in 1614.<ref>{{cite book|title=Peregrinação: volume I|last=Pinto|first= Fernão Mendes|location=Rio de Janeiro|publisher=Fundação Darcy Ribeiro|date=2013|orig-date=1614|url=https://fundar.org.br/wp-content/uploads/2021/06/peregrinacao-vol-1.pdf|pages=181, 295}}</ref> The earliest form in English was "touffon" (1588),<ref name="online"/> later as touffon, tuffon, tufon, tuffin, tuffoon, tayfun, tiffoon, typhawn.<ref name="Fu 2023">{{cite journal |author=Fu |display-authors=et al |date=2023 |title=Historic and Future Perspectives of Storm and Cyclone |url=https://link.springer.com/content/pdf/10.1007/s00376-022-2184-1.pdf?error=cookies_not_supported&code=9b4e99db-050b-43d1-a238-bce77d44ed41 |journal=Advances in Atmospheric Sciences |volume=40 |issue=3 |pages=450–451 |bibcode=2023AdAtS..40..447F |doi=10.1007/s00376-022-2184-1 |issn=0256-1530 |s2cid=253918708}}</ref><ref name="Wu 2020">{{cite journal |last=Wu |first=Liguang |date=2020 |title=台风一词的历史沿革 |trans-title=Historical evolution of the word 'Typhoon' |url=http://html.rhhz.net/qxxb_cn/html/2020072.htm |journal=气象学报 (Acta Meteorologica Sinica) |volume=78 |issue=6 |pages=1065–1075 |doi=10.11676/qxxb2020.072 |issn=0577-6619}}</ref> | |||
=== Intensity classifications === | |||
{{See also|Tropical cyclone scales}} | |||
{{Japan Meteorological Agency's Tropical Cyclone Intensity Scale}} | {{Japan Meteorological Agency's Tropical Cyclone Intensity Scale}} | ||
{{see also|Tropical cyclone scales}} | |||
A ''tropical depression'' is the lowest category that the ] uses and is the term used for a tropical system that has wind speeds not exceeding {{convert|33|kn|mph km/h}}.<ref name="TCOM">{{cite web|url=http://www.wmo.ch/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf|format=PDF|year=2008|publisher=]|title=Typhoon Committee Operational Manual|author=Typhoon Committee|accessdate=2008-12-23}}</ref> A tropical depression is upgraded to a ''tropical storm'' should its ] exceed {{convert|34|kn|mph km/h}}. Tropical storms also receive official names from RSMC Tokyo.<ref name="TCOM"/> Should the storm intensify further and reach sustained wind speeds of {{convert|48|kn|mph km/h}} then it will be classified as a ''severe tropical storm''.<ref name="TCOM"/> Once the system's maximum sustained winds reach wind speeds of {{convert|64|kn|mph km/h}}, the JMA will designate the tropical cyclone as a ''typhoon''—the highest category on its scale.<ref name="TCOM"/> | |||
A ''tropical depression'' is the lowest category that the ] uses and is the term used for a tropical system that has wind speeds not exceeding {{convert|33|kn|mph km/h}}.<ref name="TCOM">{{cite web |author=Typhoon Committee |year=2008 |title=Typhoon Committee Operational Manual |url=http://www.wmo.ch/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf |url-status=dead |archive-url=https://web.archive.org/web/20120717055253/http://www.wmo.int/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf |archive-date=2012-07-17 |access-date=2008-12-23 |publisher=] |type=report}}</ref> A tropical depression is upgraded to a ''tropical storm'' should its ] exceed {{convert|34|kn|mph km/h}}. Tropical storms also receive official names from RSMC Tokyo.<ref name="TCOM" /> Should the storm intensify further and reach sustained wind speeds of {{convert|48|kn|mph km/h}} then it will be classified as a ''severe tropical storm''.<ref name="TCOM" /> Once the system's maximum sustained winds reach wind speeds of {{convert|64|kn|mph km/h}}, the JMA will designate the tropical cyclone as a ''typhoon''—the highest category on its scale.<ref name="TCOM" /> | |||
From 2009 the ] started to further divide typhoons into three different classifications: ''typhoon'', ''severe typhoon'' and ''super typhoon''.<ref name="HKO"/> A ''typhoon'' has wind speed of 64-79 knots (73-91 mph; 118–149 km/h), a severe typhoon has winds of at least {{convert|80|kn|mph km/h}}, and a super typhoon has winds of at least {{convert|100|kn|mph km/h}}.<ref name="HKO">{{cite web|url=http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|title=Classifications of Tropical cyclones|date=2009-03-18|publisher=]|accessdate=2009-04-27}}</ref> The ]' ] (JTWC) unofficially classifies typhoons with wind speeds of at least 130 knots (67 m/s; 150 mph; 241 km/h)—the equivalent of a strong Category 4 storm in the ]—as ''super typhoons''.<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|author=] | title = What are the description labels used with tropical cyclones by JTWC?|publisher=] - Frequently Asked Questions (FAQ)|date=2008-03-31|accessdate=2008-12-22}}</ref> However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.' ] and ]. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter are based on a 10-minute averaging interval.<ref name="JTWC FAQ fcstdiff">{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|title=How are JTWC forecasts different than forecasts issued by tropical cyclone warning centres (TCWCs) of other countries?|date=2008-03-31|publisher=]|accessdate=2008-12-26}}</ref> | |||
Since 2009 the ] has divided typhoons into three different classifications: ''typhoon'', ''severe typhoon'' and ''super typhoon''.<ref name="HKO" /> A ''typhoon'' has wind speed of 64–79 knots (73–91 mph; 118–149 km/h), a severe typhoon has winds of at least {{convert|80|kn|mph km/h}}, and a super typhoon has winds of at least {{convert|100|kn|mph km/h}}.<ref name="HKO">{{cite web|url=http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|title=Classifications of Tropical cyclones|date=2009-03-18|publisher=]|access-date=2009-04-27|archive-url=https://web.archive.org/web/20120330002011/http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|archive-date=2012-03-30|url-status=dead}}</ref> The ]' ] (JTWC) unofficially classifies typhoons with wind speeds of at least 130 knots (67 m/s; 150 mph; 241 km/h)—the equivalent of a strong Category 4 storm in the ]—as ''super typhoons''.<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|author=Joint Typhoon Warning Center|title=What are the description labels used with tropical cyclones by JTWC?|publisher=] – Frequently Asked Questions (FAQ)|date=2008-03-31|access-date=2008-12-22|author-link=Joint Typhoon Warning Center|archive-date=2012-07-15|archive-url=https://web.archive.org/web/20120715214854/http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|url-status=live}}</ref> However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.'s ] and ]. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter is based on a 10-minute averaging interval.<ref name="JTWC FAQ fcstdiff">{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|title=How are JTWC forecasts different than forecasts issued by tropical cyclone warning centres (TCWCs) of other countries?|date=2008-03-31|publisher=]|access-date=2008-12-26|archive-date=2012-07-15|archive-url=https://web.archive.org/web/20120715214854/http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|url-status=live}}</ref> | |||
==Genesis== | == Genesis == | ||
] on October 1, 2006]] | ] on October 1, 2006]] | ||
{{See also|Tropical cyclogenesis}} | {{See also|Tropical cyclogenesis}} | ||
There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high ] in the lower to middle levels of the ], enough ] |
There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high ] in the lower to middle levels of the ], enough ] to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, ] that a tropical cyclone will form. Normally, an ocean temperature of 26.5 °C (79.7 °F) spanning through a depth of at least {{convert|50|m|ft}} is considered the minimum to maintain the special ] that is the tropical cyclone. These warm waters are needed to maintain the ] that fuels tropical systems. A minimum distance of 500 km (300 mi) from the ] is normally needed for tropical cyclogenesis.<ref name="A15" /> | ||
Whether it be a depression in the ] (ITCZ) or ], a broad ], or an ], a low level feature with sufficient ] and convergence is required to begin tropical cyclogenesis. About 85 to 90 percent of Pacific typhoons form within the ].<ref name="KingTUTT">{{cite book|url=https://books.google.com/books?id=uZvIuDv6A4gC&q=typhoon+origins+northwest+Pacific&pg=PA515|pages=520–521|title=Synoptic and dynamic climatology|author1=Roger Graham Barry|author2=Andrew Mark Carleto|year=2001|publisher=Psychology Press|isbn=978-0-415-03115-8|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112032/https://books.google.com/books?id=uZvIuDv6A4gC&q=typhoon+origins+northwest+Pacific&pg=PA515|url-status=live}}</ref> Even with perfect upper-level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10 m/s (20 kn, 33 ft/s) between the ocean surface and the ] is required for tropical cyclone development.<ref name="A15">{{cite web |author1=] |author1-link= |title=Subject: A15) How do tropical cyclones form ? |url=http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |website= NOAA's Atlantic Oceanographic and Meteorological Laboratory |publisher=] |access-date=2011-03-24 |archive-url=https://web.archive.org/web/20090827030639/http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |archive-date=2009-08-27 |location= |pages= |doi= |date=1 June 2010}}</ref><ref>{{cite web |title=Hurricane FAQ |url=http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |website=NOAA's Atlantic Oceanographic and Meteorological Laboratory |access-date=}}</ref> Typically with Pacific typhoons, there are two ] of ]: one to the north ahead of an upper trough in the ], and a second towards the equator.<ref name="KingTUTT" /> | |||
In general, the westerly wind increases associated with the ] lead to increased tropical cyclogenesis in all ]. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's summer season.<ref name="AMS2">{{Cite journal |author1=John Molinari |author2=David Vollaro |date=September 2000 |title=Planetary- and Synoptic-Scale Influences on Eastern Pacific Tropical Cyclogenesis |journal=] |volume=128 |issue=9 |pages=3296–307 |bibcode=2000MWRv..128.3296M |doi=10.1175/1520-0493(2000)128<3296:PASSIO>2.0.CO;2 |issn=0027-0644 |s2cid=9278279|doi-access=free }}</ref> On average, twice per year twin tropical cyclones will form in the western Pacific Ocean, near the ] and the ], along the same meridian, or line of longitude.<ref>{{cite book|url=https://books.google.com/books?id=RUbq73qXIIkC&q=typhoon+origins+northwest+Pacific&pg=PA269|page=271|title=Atmosphere, weather, and climate|author1=Roger Graham Barry|author2=Richard J. Chorley|year=2003|publisher=Psychology Press|isbn=978-0-415-27170-7|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112033/https://books.google.com/books?id=RUbq73qXIIkC&q=typhoon+origins+northwest+Pacific&pg=PA269|url-status=live}}</ref> There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the North Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the Madden–Julian oscillation, or MJO, which is normally in opposite modes between the two basins at any given time.<ref name="Mad-Jul">{{Cite journal |author1=E. D. Maloney |author2=D. L. Hartmann |date=September 2001 |title=The Madden–Julian Oscillation, Barotropic Dynamics, and North Pacific Tropical Cyclone Formation. Part I: Observations |journal=] |volume=58 |issue=17 |pages=2545–2558 |bibcode=2001JAtS...58.2545M |citeseerx=10.1.1.583.3789 |doi=10.1175/1520-0469(2001)058<2545:TMJOBD>2.0.CO;2 |issn=0022-4928 |s2cid=35852730}}</ref> | |||
Whether it be a depression in the ] or ], a broad ], or an ], a low level feature with sufficient ] and convergence is required to begin tropical cyclogenesis. About 85 to 90 percent of Pacific typhoons form within the monsoon trough.<ref name="KingTUTT">{{cite book|url=http://books.google.com/?id=uZvIuDv6A4gC&pg=PA515&dq=typhoon+origins+northwest+Pacific#v=onepage&q&f=false|pages=520–521|title=Synoptic and dynamic climatology|author=Roger Graham Barry and Andrew Mark Carleton|year=2001|publisher=Psychology Press|isbn=978-0-415-03115-8|accessdate=2011-03-06}}</ref> Even with perfect upper level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10 m/s (20 kn, 33 ft/s) between the ocean surface and the ] is required for tropical cyclone development.<ref name="A15">] ({{date|2010-06-01}}). ]. Retrieved on 2011-03-24.</ref> Typically with Pacific typhoons, there are two ] ]: one to the north ahead of an upper trough in the ], and a second towards the equator.<ref name="KingTUTT"/> | |||
== Frequency == | |||
In general, westerly wind increases associated with the ] lead to increased tropical cyclogenesis in all ]. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's ] season.<ref name="AMS2">{{Cite journal| author = John Molinari and David Vollaro | url = http://ams.allenpress.com/perlserv/?request=get-document&doi=10.1175%2F1520-0493(2000)128%3C3296:PASSIO%3E2.0.CO%3B2 | title = Planetary- and Synoptic-Scale Influences on Eastern Pacific Tropical Cyclogenesis | journal = ] | volume = 128 | issue = 9 |date=September 2000 | accessdate = 2006-10-20 | pages = 3296–307 | doi = 10.1175/1520-0493(2000)128<3296:PASSIO>2.0.CO;2|bibcode = 2000MWRv..128.3296M }}</ref> On average, twice per year twin tropical cyclones will form in the western Pacific ocean, near the ] and the ], along the same meridian, or line of longitude.<ref>{{cite book|url=http://books.google.com/?id=RUbq73qXIIkC&pg=PA269&dq=typhoon+origins+northwest+Pacific#v=onepage&q&f=false|page=271|title=Atmosphere, weather, and climate|author=Roger Graham Barry and Richard J. Chorley|year=2003|publisher=Psychology Press|isbn=978-0-415-27170-7|accessdate=2011-03-06}}</ref> There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the north Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the ], or MJO, which is normally in opposite modes between the two basins at any given time.<ref name="Mad-Jul">{{Cite journal| doi = 10.1175/1520-0469(2001)058<2545:TMJOBD>2.0.CO;2| title = The Madden–Julian Oscillation, Barotropic Dynamics, and North Pacific Tropical Cyclone Formation. Part I: Observations | author = E. D. Maloney and D. L. Hartmann | url = http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469%282001%29058%3C2545%3ATMJOBD%3E2.0.CO%3B2 | format = PDF | journal = ] |date=September 2001 | volume = 58 | issue = 17 | pages = 2545–2558 | accessdate = 2008-06-24|bibcode = 2001JAtS...58.2545M }}</ref> | |||
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right" | |||
|+Storm Frequency<br />Tropical storms and Typhoons by month,<br />for the period 1959–2015 | |||
==Frequency== | |||
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right;" HL + | |||
|+Storm Frequency<br>Tropical storms and Typhoons by month,<br>for the period 1959–2011 | |||
(Northwest Pacific) | (Northwest Pacific) | ||
|- | |- | ||
Line 43: | Line 56: | ||
! Average | ! Average | ||
|- | |- | ||
| Jan || |
| Jan || 28 || 0.5 | ||
|- | |- | ||
| Feb || |
| Feb || 14 || 0.2 | ||
|- | |- | ||
| Mar || |
| Mar || 26 || 0.5 | ||
|- | |- | ||
| Apr || |
| Apr || 37 || 0.6 | ||
|- | |- | ||
| May || |
| May || 66 || 1.2 | ||
|- | |- | ||
| Jun || |
| Jun || 100 || 1.8 | ||
|- | |- | ||
| Jul || |
| Jul || 221 || 3.9 | ||
|- | |- | ||
| Aug || |
| Aug || 310 || 5.4 | ||
|- | |- | ||
| Sep || |
| Sep || 280 || 4.9 | ||
|- | |- | ||
| Oct || |
| Oct || 228 || 4.0 | ||
|- | |- | ||
| Nov || |
| Nov || 139 || 2.4 | ||
|- | |- | ||
| Dec || |
| Dec || 69 || 1.2 | ||
|- | |- | ||
| Annual || |
| Annual || 1518 || 26.6 | ||
|- | |- | ||
| colspan="3" style="text-align:center;"|Source: '''JTWC'''<ref>{{cite report|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/atcr/ |
| colspan="3" style="text-align:center;"|Source: '''JTWC'''<ref>{{cite report|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/atcr/2015atcr.pdf|title=2015 Annual Tropical Cyclone Report: Western Pacific|year=2015|access-date=2016-07-11|author=Joint Typhoon Warning Center|publisher=United States Navy, United States Air Force}}{{dead link|date=December 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> | ||
|year=2011|accessdate=2013-02-07|author=Joint Typhoon Warning Center|publisher=United States Navy, United States Air Force}}</ref> | |||
|} | |} | ||
Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth.<ref name="enso">{{cite journal|journal=Climate Research|volume=25|page=43|url=http://www.int-res.com/articles/cr2003/25/c025p043.pdf |
Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth.<ref name="enso">{{cite journal |author1=James B. Elsner |author2=Kam-Biu Liu |date=2003-10-08 |title=Examining the ENSO-Typhoon Hypothesis |url=https://www.int-res.com/articles/cr2003/25/c025p043.pdf |url-status=live |journal=Climate Research |volume=25 |page=43 |bibcode=2003ClRes..25...43E |doi=10.3354/cr025043 |issn=0936-577X |archive-url=https://web.archive.org/web/20080409132416/http://www.int-res.com/articles/cr2003/25/c025p043.pdf |archive-date=2008-04-09 |access-date=2007-08-18 |doi-access=free}}</ref> Pacific typhoons have formed year-round, with peak months from August to October. The peak months correspond to that of the ]s. Along with a high storm frequency, this basin also features the most globally ] on record. One of the most recent busy seasons was ]. Tropical cyclones form in any month of the year across the northwest Pacific Ocean and concentrate around June and November in the northern Indian Ocean. The area just northeast of the Philippines is the most active place on Earth for tropical cyclones to exist. | ||
Across the Philippines themselves, activity reaches a minimum in February, before increasing steadily through June and spiking from July through October, with September being the most active month for tropical cyclones across the ]. Activity falls off significantly in November, although ], the strongest Philippine typhoon on record, was a November typhoon.<ref>{{cite journal |first1=Ricardo |last1=García-Herrera |first2=Pedro |last2=Ribera |first3=Emiliano |last3=Hernández |first4=Luis |last4=Gimeno |year=2006 |title=Typhoons in the Philippine Islands, 1566–1900 |url=http://www.typhoon2000.ph/stormstats/PhilippineTyphoons1566-1900.pdf |url-status=live |journal=Journal of Geophysical Research |volume=112 |issue=D6 |page=40 |bibcode=2007JGRD..112.6108G |bibcode-access=free |doi=10.1029/2006JD007370 |doi-access=free |issn=0148-0227 |archive-url=https://web.archive.org/web/20091007120619/http://www.typhoon2000.ph/stormstats/PhilippineTyphoons1566-1900.pdf |archive-date=2009-10-07 |access-date=2010-04-13}}</ref> The most frequently impacted areas of the Philippines by tropical cyclones are northern and central ] and eastern ].<ref>{{cite book|author=Colleen A. Sexton|url=https://archive.org/details/philippinesinpic0000sext|url-access=registration|quote=most active typhoon season for the Philippines.|title=Philippines in Pictures|publisher=Twenty-First Century Books|access-date=2008-11-01|isbn=978-0-8225-2677-3|year=2006|page=}}</ref> A ten-year average of satellite determined precipitation showed that at least 30 percent of the annual rainfall in the northern Philippines could be traced to tropical cyclones, while the southern islands receive less than 10 percent of their annual rainfall from tropical cyclones.<ref>{{cite journal |author1=Edward B. Rodgers |author2=Robert F. Adler |author3=Harold F. Pierce |date=October 2000 |title=Contribution of Tropical Cyclones to the North Pacific Climatological Rainfall as Observed from Satellites |journal=Journal of Applied Meteorology |volume=39 |issue=10 |page=1662 |bibcode=2000JApMe..39.1658R |doi=10.1175/1520-0450(2000)039<1658:COTCTT>2.0.CO;2 |issn=1558-8424 |hdl-access=free |hdl=2060/19990109670}}</ref> The genesis and intensity of typhoons are also modulated by slow variation of the sea surface temperature and circulation features following a near-10-year frequency.<ref name="WangClark2010">{{cite journal |last1=Wang |first1=Shih-Yu |last2=Clark |first2=Adam J. |date= 2011 |title=Quasi-decadal spectral peaks of tropical western Pacific SSTs as a precursor for tropical cyclone threat |journal= Geophysical Research Letters |language=en |volume=37 |issue=21 |pages=n/a |doi=10.1029/2010GL044709 |issn=0094-8276 |pmid=|bibcode=2010GeoRL..3721810W |s2cid=39433860 |doi-access=free }}</ref> | |||
==Paths== | |||
] between 1980 and 2005. The vertical line to the right is the ].]] | |||
Most tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the ].<ref>{{cite web|author=Joint Typhoon Warning Center|year=2006|url=http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|title=3.3 JTWC Forecasting Philosophies|publisher=]|accessdate=2007-02-11}}</ref> When the subtropical ridge position shifts due to ], so will the preferred tropical cyclone tracks. Areas west of Japan and ] tend to experience much fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near ] which would favor the Japanese archipelago.<ref name="China"/> During La Niña years, the formation of tropical cyclones, along with the subtropical ridge position, shifts westward across the western Pacific ocean, which increases the landfall threat to ] and greater intensity to ].<ref name="China">{{cite journal|author=M. C. Wu, W. L. Chang, and W. M. Leung|year=2003|url=http://ams.allenpress.com/perlserv/?request=get-document&doi=10.1175%2F1520-0442(2004)017%3C1419:IOENOE%3E2.0.CO%3B2|title=Impacts of El Nino-Southern Oscillation Events on Tropical Cyclone Landfalling Activity in the Western North Pacific|volume=17|journal=Journal of Climate|pages=1419–1428|accessdate=2007-02-11|doi=10.1175/1520-0442(2004)017<1419:IOENOE>2.0.CO;2|issue=6|bibcode=2004JCli...17.1419W}}</ref> Those that form near the ] find their way to ], Korea.<ref>{{cite book|url=http://books.google.com/?id=Za4my8EshDEC&pg=PA51&dq=where+most+typhoons+form+northwest+Pacific#v=onepage&q&f=false|page=51|title=The architecture of ideology: neo-Confucian imprinting on Cheju Island, Korea|author=David J. Nemeth|year=1987|publisher=University of California Press|isbn=978-0-520-09713-1|accessdate=2011-03-06}}</ref> | |||
== Paths == | |||
Typhoon paths follow three general directions.<ref name="enso"/> | |||
{{See also|Monsoon trough}} | |||
] between 1980 and 2005. The vertical line to the right is the ].]] | |||
Most tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the ].<ref>{{cite web|author=Joint Typhoon Warning Center|year=2006|url=http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|title=3.3 JTWC Forecasting Philosophies|publisher=]|access-date=2007-02-11|archive-date=2012-07-05|archive-url=https://web.archive.org/web/20120705161830/http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|url-status=live}}</ref> Most typhoons form in a region in the northwest Pacific known as typhoon alley, where the planet's most powerful tropical cyclones most frequently develop.<ref name="typhoon alley">{{cite web|url=https://weather.com/storms/typhoon/news/typhoon-alley-most-powerful-cyclone-earth|title=Typhoon Alley: Where the Planet's Most Intense Tropical Cyclones Most Frequently Happen|author=Jonathan Belles|publisher=]|date=July 6, 2016|access-date=April 12, 2019|archive-date=April 12, 2019|archive-url=https://web.archive.org/web/20190412095427/https://weather.com/storms/typhoon/news/typhoon-alley-most-powerful-cyclone-earth|url-status=live}}</ref> When the subtropical ridge shifts due to ], so will the preferred tropical cyclone tracks. Areas west of Japan and ] tend to experience many fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near ], which would favor the Japanese archipelago.<ref name="China" /> During La Niña years, the formation of tropical cyclones, and the subtropical ridge position, shift westward across the western Pacific Ocean, which increases the landfall threat to ] and greater intensity to ].<ref name="China">{{cite journal |author1=M. C. Wu |author2=W. L. Chang |author3=W. M. Leung |year=2003 |title=Impacts of El Nino-Southern Oscillation Events on Tropical Cyclone Landfalling Activity in the Western North Pacific |journal=Journal of Climate |volume=17 |issue=6 |pages=1419–1428 |bibcode=2004JCli...17.1419W |citeseerx=10.1.1.461.2391 |doi=10.1175/1520-0442(2004)017<1419:IOENOE>2.0.CO;2 |issn=0894-8755}}</ref> Those that form near the ] find their way to ], Korea.<ref>{{cite book|url=https://books.google.com/books?id=Za4my8EshDEC&q=where+most+typhoons+form+northwest+Pacific&pg=PA51|page=51|title=The architecture of ideology: neo-Confucian imprinting on Cheju Island, Korea|author=David J. Nemeth|year=1987|publisher=University of California Press|isbn=978-0-520-09713-1|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112033/https://books.google.com/books?id=Za4my8EshDEC&q=where+most+typhoons+form+northwest+Pacific&pg=PA51|url-status=live}}</ref> Typhoon paths follow three general directions.<ref name="enso" /> | |||
* Straight track (or straight runner). A general westward path affects the ], southern China, ], and ]. | * Straight track (or straight runner). A general westward path affects the ], southern China, ], and ]. | ||
* A parabolic |
* A parabolic recurving track. Storms recurving affect the eastern Philippines, eastern China, Taiwan, Korea, Japan, and the Russian Far East. | ||
* Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands. | * Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands. | ||
A rare few storms, like ], were redesignated as typhoons as |
A rare few storms, like ], were redesignated as typhoons as they originated in the Eastern/Central Pacific and moved into the western Pacific. | ||
== Basin monitoring == | |||
{{see also|Hurricane belt}} | |||
Within the Western Pacific, ], part of the ], has had the official warning responsibility for the whole of the Western Pacific since 1989,<ref name="JMA2000">{{cite web|url=http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|pages=iii,11|title=Annual Report on Activities of the RSMC Tokyo – Typhoon Center: 2000|author=Japan Meteorological Agency|date=2001-05-25|access-date=2011-03-11|author-link=Japan Meteorological Agency|archive-date=2013-12-12|archive-url=https://web.archive.org/web/20131212234149/http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|url-status=live}}</ref> and the naming responsibility for systems of tropical storm strength or greater since 2000.<ref name="HKO" /> However each ] within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies,<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/products-and-services-notice|title=Products and Service Notice|access-date=2011-03-11|year=2011|author=Naval Meteorology and Oceanography Command|publisher=]|archive-date=2017-06-09|archive-url=https://web.archive.org/web/20170609092158/http://www.usno.navy.mil/JTWC/products-and-services-notice|url-status=live}}</ref> the ] (PAGASA) for interests in the island archipelago nation,<ref>{{cite web|url=http://www.pagasa.dost.gov.ph/mission.shtml |title=Mission/Vision |author=Philippine Atmospheric, Geophysical & Astronomical Services Administration |year=2004 |access-date=2011-03-11 |url-status=dead |archive-url=https://web.archive.org/web/20040422082657/http://www.pagasa.dost.gov.ph/mission.shtml |archive-date=2004-04-22 }}</ref> and the ] for storms that come close enough to cause the issuance of ].<ref>{{cite web|url=http://www.weather.gov.hk/publica/tc/tc2009.pdf|date=September 2010|access-date=2011-03-11|title=Tropical Cyclones in 2009|author=Hong Kong Observatory|pages=18–19|archive-date=2017-06-29|archive-url=https://web.archive.org/web/20170629115042/http://www.weather.gov.hk/publica/tc/tc2009.pdf|url-status=dead}}</ref> | |||
=== Name sources and name list === | |||
==Basin monitoring== | |||
The list of names consists of entries from 14 southeast and east Asian nations and regions and the United States who have territories directly affected by typhoons. The submitted names are arranged into a list, the names on the list will be used from up to down, from left to right. When all names on the list are used, it will start again from the left-top corner. When a typhoon causes damage in a region, the affected region can request for retiring the name in the next session of the ESCAP/WMO Typhoon Committee. A new name will be decided by the region whose name was retired. | |||
Within the Western Pacific, ], part of the ] has had the official warning responsibility for the whole of the Western Pacific since 1989,<ref name="JMA2000"/> and the naming responsibility for systems of tropical storm strength or greater since 2000.<ref name="HKO"/> However each ] within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies,<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/products-and-services-notice|title=Products and Service Notice|accessdate=2011-03-11|year=2011|author=Naval Meteorology and Oceanography Command|publisher=]}}</ref> the ] (PAGASA) for interests in the island archipelago nation,<ref name="HKO">{{cite web|url=http://www.pagasa.dost.gov.ph/mission.shtml|title=Mission/Vision|author=Philippine Atmospheric, Geophysical & Astronomical Services Administration|year=2004|accessdate=2011-03-11}}</ref> and the ] for storms which come close enough to cause the issuance of ].<ref>{{cite web|url=http://www.weather.gov.hk/publica/tc/tc2009.pdf|date=September 2010|accessdate=2011-03-11|title=Tropical Cyclones in 2009|author=Hong Kong Observatory|pages=18–19}}</ref> | |||
Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, Philippines (PAGASA) retains its own naming list, which consists of both human names and other objects.<ref name="TyphoonBasic">{{cite news|url=https://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|access-date=2008-08-18|work=USA Today|date=2007-11-01|archive-date=2008-09-30|archive-url=https://web.archive.org/web/20080930180613/http://www.usatoday.com/weather/hurricane/typhoon-names.htm|url-status=dead }}</ref> Japan and some other East Asian countries also assign numbers to typhoons.<ref>{{Cite web |title=Digital Typhoon: Typhoon Names (Asian Names) |url=http://agora.ex.nii.ac.jp/digital-typhoon/help/tcnames.html.en#:~:text=Number-based%20conventions%20are%20based,typhoon%20of%20the%20typhoon%20season. |access-date=2023-07-31 |website=agora.ex.nii.ac.jp}}</ref> | |||
===Name sources=== | |||
The list of names consists of entries from 17 Southeast and East Asian nations and the United States who have territories directly affected by typhoons. The submitted names are arranged into five lists; and each list is cycled with each year. Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, PAGASA retains its own naming list, which does consist of human names.<ref name="TyphoonBasic"> | |||
{{cite news|url=http://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|accessdate=2008-08-18|work=USA Today | date=2007-11-01}}</ref> Therefore, a typhoon can possibly have two names. Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon. In Japan, typhoons are also given a numerical designation according to the sequence of their occurrence in the calendar year.<ref name="JMA2000">{{cite web|url=http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|pages=iii,11|title=Annual Report on Activities of the RSMC Tokyo – Typhoon Center: 2000|author=]|date=2001-05-25|accessdate=2011-03-11}}</ref> | |||
Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon. | |||
{{clear}} | |||
{| class="wikitable" style="width:100%" | |||
==Records== | |||
|+List of Western Pacific tropical cyclone names <small>(as of 2024)</small> | |||
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right;" HL + | |||
|- | |- | ||
!scope="col" rowspan=2 | List | |||
!Total<br />Storms | |||
!scope="col" colspan=14| Contributing nations/regions | |||
!Year | |||
|- | |||
!Tropical<br />Storms | |||
!scope="col"|{{KHM}} | |||
!Typhoons | |||
!scope="col"|{{CHN}} | |||
!Super<br />Typhoons | |||
!scope="col"|{{PRK}} | |||
!scope="col"|{{HKG-CHN}} | |||
!scope="col"|{{JPN}} | |||
!scope="col"|{{LAO}} | |||
!scope="col"|{{MAC-CHN}} | |||
!scope="col"|{{MYS}} | |||
!scope="col"|{{FSM}} | |||
!scope="col"|{{PHI}} | |||
!scope="col"|{{KOR}} | |||
!scope="col"|{{THA}} | |||
!scope="col"|{{USA}} | |||
!scope="col"|{{VIE}} | |||
|- | |||
!scope="row" rowspan=2| 1 | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
!scope="row" rowspan=2| 2 | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
!scope="row" rowspan=2| 3 | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|- | |||
!scope="row" rowspan=2| 4 | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
!scope="row" rowspan=2| 5 | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
|]||]||]||]||]||]||]||]||]||]||]||]||]||] | |||
|- | |||
!colspan=20|References:<ref>{{Cite web|url=https://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/tyname.html|title=List of names for tropical cyclones adopted by the ESCAP/WMO Typhoon Committee for the western North Pacific and the South China Sea (valid as of 2019)|website=]: ]|publisher=Japan Meteorological Agency|author=RSMC Tokyo-Typhoon Center|access-date=October 25, 2019|archive-date=January 5, 2021|archive-url=https://web.archive.org/web/20210105031223/http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/tyname.html|url-status=live}}</ref> | |||
|} | |||
== Records == | |||
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right; clear:right" | |||
|- | |||
! Total<br />storms | |||
! Year | |||
! Tropical<br />storms | |||
! Typhoons | |||
! Super<br />typhoons | |||
|- | |- | ||
| 39 || ] || 13 || 19 || 7 | | 39 || ] || 13 || 19 || 7 | ||
Line 119: | Line 182: | ||
| 30 || ]<br />]<br />]<br />]<br />] || 7<br />10<br />8<br />9<br />10<br /> || 17<br />17<br />20<br />17<br />13 || 6<br />3<br />2<br />4<br />7 | | 30 || ]<br />]<br />]<br />]<br />] || 7<br />10<br />8<br />9<br />10<br /> || 17<br />17<br />20<br />17<br />13 || 6<br />3<br />2<br />4<br />7 | ||
|} | |} | ||
The most active Western Pacific typhoon season was in 1964,{{citation needed|date=September 2012}} when 39 storms of tropical storm strength formed. The least activity seen in the northwest Pacific |
The most active Western Pacific typhoon season was in ],{{citation needed|date=September 2012}} when 39 storms of tropical storm strength formed. Only 15 seasons had 30 or more storms developing since reliable records began. The least activity seen in the northwest Pacific Ocean was during the ], when only 14 tropical storms and seven typhoons formed. In the Philippines, the most active season since 1945 for tropical cyclone strikes was ], when nineteen tropical cyclones moved through the country.<ref>{{cite web|author=Joint Typhoon Warning Center|year=2009|url=http://www.typhooncommittee.org/41st/docs/TC2_MemberReport2008_PHILIPPINES1.pdf|title=Member Report Republic of the Philippines|work=]|publisher=]|access-date=2010-04-14|author-link=Joint Typhoon Warning Center|archive-date=2019-09-12|archive-url=https://web.archive.org/web/20190912115140/http://www.typhooncommittee.org/41st/docs/TC2_MemberReport2008_PHILIPPINES1.pdf|url-status=live}}</ref> There was only one tropical cyclone that moved through the Philippines in ]. The ] was the busiest for Okinawa since 1957.<ref>{{cite news|url=http://www.stripes.com/news/preparation-critical-for-japan-s-coming-typhoon-season-1.33979|publisher=Stars and Stripes|title=Preparation critical for Japan's coming typhoon season|author=Erik Slavin|date=2005-05-30|access-date=2011-03-06|archive-date=2011-06-28|archive-url=https://web.archive.org/web/20110628213824/http://www.stripes.com/news/preparation-critical-for-japan-s-coming-typhoon-season-1.33979|url-status=live}}</ref> Within ] in southern China, during the past thousand years, the most active decades for typhoon strikes were the 1660s and 1670s.<ref>{{cite journal|journal=Annals of the Association of American Geographers|year=2001|author1=Kam-Biu Liu |author2=Caiming Shen |author3=Kin-Sheun Louie |title=A 1,000-Year History of Typhoon Landfalls in Guangdong, Southern China, Reconstructed from Chinese Historical Documentary Records|volume=91|issue=3|pages=453–464|issn=0004-5608|doi=10.1111/0004-5608.00253|s2cid=53066209}}</ref> | ||
The highest |
The highest reliably-estimated ]s on record for a typhoon was that of ] at {{convert|195|mph|km/h|order=flip|abbr=on}} shortly before its landfall in the central ] on November 8, 2013.<ref>{{cite news |url=https://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/11/07/super-typhoon-haiyan-closes-in-on-philippines-among-strongest-storms-ever/ |title=Among Strongest Storms Ever |last=Samenow |first=Jason |author2=McNoldy Brian |newspaper=The Washington Post |date=2013-11-08 |access-date=2013-11-08 |archive-date=2013-11-08 |archive-url=https://web.archive.org/web/20131108103028/http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/11/07/super-typhoon-haiyan-closes-in-on-philippines-among-strongest-storms-ever/ |url-status=live }}</ref> The most intense storm based on minimum pressure was ] in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of {{Convert|870|hPa|inHg}} and maximum sustained wind speeds of 165 knots (85 m/s, 190 mph, 310 km/h).<ref name="JTWC">{{cite journal|author1=George M. Dunnavan |author2=John W. Diercks |year=1980|issue=11|pages=1915–1923|title=An Analysis of Super Typhoon Tip (October 1979)|journal=Monthly Weather Review|volume=108|doi=10.1175/1520-0493(1980)108<1915:AAOSTT>2.0.CO;2|bibcode = 1980MWRv..108.1915D|issn=1520-0493 |doi-access=free}}</ref> The deadliest typhoon of the 20th century was ], which killed nearly 100,000 in China in 1975 due to a flood that caused 12 reservoirs to fail.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/iwtc/AndersonBerry5-1.html|title=Fifth International Workshop on Tropycal Cyclones: Topic 5.1: Societal Impacts of Tropical Cyclones.|last=Anderson-Berry|first=Linda J.|author2=Weyman James C.|date=2008-02-26|work=World Meteorological Organization|publisher=National Oceanic and Atmospheric Administration|access-date=2011-03-31|archive-date=2012-11-14|archive-url=https://web.archive.org/web/20121114001936/http://www.aoml.noaa.gov/hrd/iwtc/AndersonBerry5-1.html|url-status=live}}</ref> After ] landed in Taiwan at midnight on August 8, 2009, almost the entire southern region of Taiwan (]/], ]/] (now merged as Tainan), ]/] (now merged as Kaohsiung), and ]) and parts of ] and ] were flooded by record-breaking heavy rain. The rainfall in ] reached 2,327 millimeters (91.6 in),<ref>{{cite web|url=http://wmo.asu.edu/Taiwan-rainfall-record-investigation|author=Arizona State University|title=Taiwan Rainfall Record Investigation|date=2009-08-12|access-date=2011-03-06|url-status=dead|archive-url=https://web.archive.org/web/20110102193453/http://wmo.asu.edu/Taiwan-rainfall-record-investigation|archive-date=2011-01-02}}</ref> breaking all rainfall records of any single place in Taiwan induced by a single typhoon,<ref>{{cite news|url=http://www.chinapost.com.tw/taiwan/national/national-news/2009/08/09/219677/RECORD-RAINS.htm|title=Record rains in south|publisher=The China Post|access-date=2009-08-09|date=2009-08-09|url-status=dead|archive-url=https://web.archive.org/web/20090812031824/http://chinapost.com.tw/taiwan/national/national-news/2009/08/09/219677/Record-rains.htm|archive-date=2009-08-12}}</ref> and making the cyclone the wettest known typhoon. | ||
==See also== | == See also == | ||
{{Portal|Tropical cyclones}} | {{Portal|Tropical cyclones}} | ||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
* ] | * ] | ||
* ] | * ] | ||
For storms that have affected countries in this basin: | |||
* ] | |||
* ] | |||
* ] | |||
* ] | * ] | ||
* ] | |||
==References== | == References == | ||
{{ |
{{reflist}} | ||
==External links== | == External links == | ||
{{WPAC EL's}} | {{WPAC EL's}} | ||
{{Good article}} | {{Good article}} | ||
{{Cyclones}} | |||
{{Authority control}} | |||
{{DEFAULTSORT:Pacific Typhoon}} | {{DEFAULTSORT:Pacific Typhoon}} | ||
] | ] | ||
] | ] | ||
] |
Latest revision as of 02:00, 2 December 2024
Tropical cyclones that develop in the Northwest Pacific Ocean Not to be confused with Typhon or Typhoo. This article is about the type of tropical cyclones. For other uses, see Typhoon (disambiguation).A typhoon is a tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere and which produces sustained hurricane-force winds of at least 119 km/h (74 mph). This region is referred to as the Northwestern Pacific Basin, accounting for almost one third of the world's tropical cyclones. The term hurricane refers to a tropical cyclone (again with sustained winds of at least 119 km/h (74 mph)) in the north central and northeast Pacific, and the north Atlantic. In all of the preceding regions, weaker tropical cyclones are called tropical storms. For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern (North America to 140°W), central (140°W to 180°), and western (180° to 100°E). The Regional Specialized Meteorological Center (RSMC) for tropical cyclone forecasts is in Japan, with other tropical cyclone warning centres for the northwest Pacific in Hawaii (the Joint Typhoon Warning Center), the Philippines, and Hong Kong. Although the RSMC names each system, the main name list itself is coordinated among 18 countries that have territories threatened by typhoons each year.
Within most of the northwestern Pacific, there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are several main requirements for typhoon formation and development. It must be in sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower-to-middle levels of the troposphere, have enough Coriolis effect to develop a low pressure centre, a pre-existing low level focus or disturbance, and a low vertical wind shear. Although the majority of storms form between June and November, a few storms may occur between December and May (although tropical cyclone formation is very rare during that time). On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the subtropical ridge towards the west or northwest, with some systems recurving near and east of Japan. The Philippines receive the brunt of the landfalls, with China and Japan being less often impacted. However, some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand-year sample via documents within their archives. Taiwan has received the wettest known typhoon on record for the northwest Pacific tropical cyclone basins. However, Vietnam recognises its typhoon season as lasting from the beginning of June through to the end of November, with an average of four to six typhoons hitting the country annually.
According to the statistics of the Joint Typhoon Warning Center, from 1950 to 2022, the Northwest Pacific generated an average of 26.5 named tropical cyclones each year, of which an average of 16.6 reached typhoon standard or above as defined by the Joint Typhoon Warning Center.
Nomenclature
Etymology
The etymology of typhoon is either Chinese or Persian-Hindustani origin.
Typhoon may trace to 風癡 (meaning "winds which long last"), first attested in 1124 in China. It was pronounced as [hɔŋ tsʰi] in Min Chinese at the time, but later evolved to . New characters 風颱 were created to match the sound, no later than 1566. The word was introduced to Mandarin Chinese in the inverted Mandarin order 颱風 [tʰaɪ fɤŋ], later picked up by foreign sailors to appear as typhoon. The usage of 颱風 was not dominant until Chu Coching, the head of meteorology of the national academy from 1929 to 1936, declared it to be the standard term. There were 29 alternative terms for typhoon recorded in a chronicle in 1762, now mostly replaced by 颱風, although 風癡 or 風颱 continues to be used in Min Chinese- and Wu Chinese- speaking areas from Chaozhou, Guangdong to Taizhou, Zhejiang.
Some English linguists proposed the English word typhoon traced to the Cantonese pronunciation of 颱風 [tʰɔi fuŋ] (correspond to Mandarin [tʰaɪ fɤŋ]), in turn the Cantonese word traced to Arabic. This claim contradicts the fact that the Cantonese term for typhoon was 風舊 [fuŋ kɐu] before the national promotion of 颱風. 風舊 (meaning "winds which long last") was first attested in 280, being the oldest Chinese term for typhoon. Not one Chinese historical record links 颱風 to an Arabic or foreign origin. On the other hand, Chinese records consistently assert foreigners refer typhoon as "black wind". "Black wind" eventually enters the vocabulary of Jin Chinese as 黑老風 [xəʔ lo fəŋ].
Alternatively, some dictionaries propose that typhoon derived from (طوفان) tūfān, meaning storm in Persian and Hindustani. The root of (طوفان) tūfān possibly traces to the Ancient Greek mythological creature Typhôn. In French typhon was attested as storm in 1504. Portuguese traveler Fernão Mendes Pinto referred to a tufão in his memoir published in 1614. The earliest form in English was "touffon" (1588), later as touffon, tuffon, tufon, tuffin, tuffoon, tayfun, tiffoon, typhawn.
Intensity classifications
See also: Tropical cyclone scalesCategory | Sustained winds |
---|---|
Violent typhoon | ≥105 knots ≥194 km/h |
Very strong typhoon | 85–104 knots 157–193 km/h |
Typhoon | 64–84 knots 118–156 km/h |
Severe tropical storm | 48–63 knots 89–117 km/h |
Tropical storm | 34–47 knots 62–88 km/h |
Tropical depression | ≤33 knots ≤61 km/h |
A tropical depression is the lowest category that the Japan Meteorological Agency uses and is the term used for a tropical system that has wind speeds not exceeding 33 knots (38 mph; 61 km/h). A tropical depression is upgraded to a tropical storm should its sustained wind speeds exceed 34 knots (39 mph; 63 km/h). Tropical storms also receive official names from RSMC Tokyo. Should the storm intensify further and reach sustained wind speeds of 48 knots (55 mph; 89 km/h) then it will be classified as a severe tropical storm. Once the system's maximum sustained winds reach wind speeds of 64 knots (74 mph; 119 km/h), the JMA will designate the tropical cyclone as a typhoon—the highest category on its scale.
Since 2009 the Hong Kong Observatory has divided typhoons into three different classifications: typhoon, severe typhoon and super typhoon. A typhoon has wind speed of 64–79 knots (73–91 mph; 118–149 km/h), a severe typhoon has winds of at least 80 knots (92 mph; 150 km/h), and a super typhoon has winds of at least 100 knots (120 mph; 190 km/h). The United States' Joint Typhoon Warning Center (JTWC) unofficially classifies typhoons with wind speeds of at least 130 knots (67 m/s; 150 mph; 241 km/h)—the equivalent of a strong Category 4 storm in the Saffir-Simpson scale—as super typhoons. However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.'s National Hurricane Center and Central Pacific Hurricane Center. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter is based on a 10-minute averaging interval.
Genesis
See also: Tropical cyclogenesisThere are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, they do not guarantee that a tropical cyclone will form. Normally, an ocean temperature of 26.5 °C (79.7 °F) spanning through a depth of at least 50 metres (160 ft) is considered the minimum to maintain the special mesocyclone that is the tropical cyclone. These warm waters are needed to maintain the warm core that fuels tropical systems. A minimum distance of 500 km (300 mi) from the equator is normally needed for tropical cyclogenesis. Whether it be a depression in the Intertropical Convergence Zone (ITCZ) or monsoon trough, a broad surface front, or an outflow boundary, a low level feature with sufficient vorticity and convergence is required to begin tropical cyclogenesis. About 85 to 90 percent of Pacific typhoons form within the monsoon trough. Even with perfect upper-level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10 m/s (20 kn, 33 ft/s) between the ocean surface and the tropopause is required for tropical cyclone development. Typically with Pacific typhoons, there are two jets of outflow: one to the north ahead of an upper trough in the westerlies, and a second towards the equator.
In general, the westerly wind increases associated with the Madden–Julian oscillation lead to increased tropical cyclogenesis in all tropical cyclone basins. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's summer season. On average, twice per year twin tropical cyclones will form in the western Pacific Ocean, near the 5th parallel north and the 5th parallel south, along the same meridian, or line of longitude. There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the North Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the Madden–Julian oscillation, or MJO, which is normally in opposite modes between the two basins at any given time.
Frequency
Month | Count | Average |
---|---|---|
Jan | 28 | 0.5 |
Feb | 14 | 0.2 |
Mar | 26 | 0.5 |
Apr | 37 | 0.6 |
May | 66 | 1.2 |
Jun | 100 | 1.8 |
Jul | 221 | 3.9 |
Aug | 310 | 5.4 |
Sep | 280 | 4.9 |
Oct | 228 | 4.0 |
Nov | 139 | 2.4 |
Dec | 69 | 1.2 |
Annual | 1518 | 26.6 |
Source: JTWC |
Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth. Pacific typhoons have formed year-round, with peak months from August to October. The peak months correspond to that of the Atlantic hurricane seasons. Along with a high storm frequency, this basin also features the most globally intense storms on record. One of the most recent busy seasons was 2013. Tropical cyclones form in any month of the year across the northwest Pacific Ocean and concentrate around June and November in the northern Indian Ocean. The area just northeast of the Philippines is the most active place on Earth for tropical cyclones to exist.
Across the Philippines themselves, activity reaches a minimum in February, before increasing steadily through June and spiking from July through October, with September being the most active month for tropical cyclones across the archipelago. Activity falls off significantly in November, although Typhoon Haiyan, the strongest Philippine typhoon on record, was a November typhoon. The most frequently impacted areas of the Philippines by tropical cyclones are northern and central Luzon and eastern Visayas. A ten-year average of satellite determined precipitation showed that at least 30 percent of the annual rainfall in the northern Philippines could be traced to tropical cyclones, while the southern islands receive less than 10 percent of their annual rainfall from tropical cyclones. The genesis and intensity of typhoons are also modulated by slow variation of the sea surface temperature and circulation features following a near-10-year frequency.
Paths
See also: Monsoon troughMost tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the westerlies. Most typhoons form in a region in the northwest Pacific known as typhoon alley, where the planet's most powerful tropical cyclones most frequently develop. When the subtropical ridge shifts due to El Niño, so will the preferred tropical cyclone tracks. Areas west of Japan and Korea tend to experience many fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near 130°E, which would favor the Japanese archipelago. During La Niña years, the formation of tropical cyclones, and the subtropical ridge position, shift westward across the western Pacific Ocean, which increases the landfall threat to China and greater intensity to Philippines. Those that form near the Marshall Islands find their way to Jeju Island, Korea. Typhoon paths follow three general directions.
- Straight track (or straight runner). A general westward path affects the Philippines, southern China, Taiwan, and Vietnam.
- A parabolic recurving track. Storms recurving affect the eastern Philippines, eastern China, Taiwan, Korea, Japan, and the Russian Far East.
- Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands.
A rare few storms, like Hurricane John, were redesignated as typhoons as they originated in the Eastern/Central Pacific and moved into the western Pacific.
Basin monitoring
Within the Western Pacific, RSMC Tokyo-Typhoon Center, part of the Japan Meteorological Agency, has had the official warning responsibility for the whole of the Western Pacific since 1989, and the naming responsibility for systems of tropical storm strength or greater since 2000. However each National Meteorological and Hydrological Service within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) for interests in the island archipelago nation, and the Hong Kong Observatory for storms that come close enough to cause the issuance of warning signals.
Name sources and name list
The list of names consists of entries from 14 southeast and east Asian nations and regions and the United States who have territories directly affected by typhoons. The submitted names are arranged into a list, the names on the list will be used from up to down, from left to right. When all names on the list are used, it will start again from the left-top corner. When a typhoon causes damage in a region, the affected region can request for retiring the name in the next session of the ESCAP/WMO Typhoon Committee. A new name will be decided by the region whose name was retired.
Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, Philippines (PAGASA) retains its own naming list, which consists of both human names and other objects. Japan and some other East Asian countries also assign numbers to typhoons.
Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon.
Records
Total storms |
Year | Tropical storms |
Typhoons | Super typhoons |
---|---|---|---|---|
39 | 1964 | 13 | 19 | 7 |
35 | 1965 1967 1971 |
14 15 11 |
10 16 16 |
11 4 4 |
34 | 1994 | 14 | 14 | 6 |
33 | 1996 | 12 | 15 | 6 |
32 | 1974 | 16 | 16 | 0 |
31 | 1989 1992 2013 |
10 13 18 |
15 17 8 |
6 5 5 |
30 | 1962 1966 1972 1990 2004 |
7 10 8 9 10 |
17 17 20 17 13 |
6 3 2 4 7 |
The most active Western Pacific typhoon season was in 1964, when 39 storms of tropical storm strength formed. Only 15 seasons had 30 or more storms developing since reliable records began. The least activity seen in the northwest Pacific Ocean was during the 2010 Pacific typhoon season, when only 14 tropical storms and seven typhoons formed. In the Philippines, the most active season since 1945 for tropical cyclone strikes was 1993, when nineteen tropical cyclones moved through the country. There was only one tropical cyclone that moved through the Philippines in 1958. The 2004 Pacific typhoon season was the busiest for Okinawa since 1957. Within Guangdong in southern China, during the past thousand years, the most active decades for typhoon strikes were the 1660s and 1670s.
The highest reliably-estimated maximum sustained winds on record for a typhoon was that of Typhoon Haiyan at 314 km/h (195 mph) shortly before its landfall in the central Philippines on November 8, 2013. The most intense storm based on minimum pressure was Typhoon Tip in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of 870 hectopascals (26 inHg) and maximum sustained wind speeds of 165 knots (85 m/s, 190 mph, 310 km/h). The deadliest typhoon of the 20th century was Typhoon Nina, which killed nearly 100,000 in China in 1975 due to a flood that caused 12 reservoirs to fail. After Typhoon Morakot landed in Taiwan at midnight on August 8, 2009, almost the entire southern region of Taiwan (Chiayi County/Chiayi City, Tainan County/Tainan City (now merged as Tainan), Kaohsiung County/Kaohsiung City (now merged as Kaohsiung), and Pingtung County) and parts of Taitung County and Nantou County were flooded by record-breaking heavy rain. The rainfall in Pingtung County reached 2,327 millimeters (91.6 in), breaking all rainfall records of any single place in Taiwan induced by a single typhoon, and making the cyclone the wettest known typhoon.
See also
- Pacific typhoon season
- Tropical cyclones in 2024
- 2024 Pacific typhoon season
- Effects of tropical cyclones
- China tropical cyclone rainfall climatology
For storms that have affected countries in this basin:
- Tropical cyclones in Malaysia
- Tropical cyclones in Vietnam
- Typhoons in the Korean peninsula
- Typhoons in the Philippines
- Typhoons in Japan
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External links
- China Meteorological Agency
- Digital Typhoon
- Hong Kong Observatory
- Japan Meteorological Agency
- Joint Typhoon Warning Center
- Korea Meteorological Administration
- Malaysian Meteorological Department
- National Weather Service Guam
- Philippine Atmospheric, Geophysical and Astronomical Services Administration
- Taiwan Central Weather Bureau
- TCWC Jakarta
- Thai Meteorological Department
- Typhoon2000
- Vietnam's National Hydro-Meteorological Service
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