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Wind speed
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==Highest speed== [[File:The Big Wind Anemometer.JPG|thumb|upright|The original anemometer that measured The Big Wind in 1934 at [[Mount Washington Observatory]]]] ===Non-tornadic=== The fastest wind speed not related to [[tornado]]es ever recorded was during the passage of Tropical [[Cyclone Olivia]] on 10 April 1996: an [[automatic weather station]] on [[Barrow Island (Western Australia)|Barrow Island]], [[Australia]], registered a maximum [[wind gust]] of {{cvt|113.3|m/s|km/h mph kn ft/s}}<ref name="courtney"/><ref>{{cite web|url=https://public-old.wmo.int/en/media/news/new-world-record-wind-gust|archive-url=https://web.archive.org/web/20231218171508/https://public-old.wmo.int/en/media/news/new-world-record-wind-gust|url-status=dead|archive-date=December 18, 2023|publisher=World Meteorological Association|title=World record wind gust|date=5 November 2015 |access-date=12 February 2017}}</ref> The wind gust was evaluated by the WMO Evaluation Panel, who found that the anemometer was mechanically sound and that the gust was within statistical probability and ratified the measurement in 2010. The anemometer was mounted 10 m above ground level (and thus 64 m above sea level). During the cyclone, several extreme gusts of greater than {{cvt|83|m/s|km/h mph kn ft/s}} were recorded, with a maximum 5-minute mean speed of {{cvt|49|m/s|km/h mph kn ft/s}}; the extreme gust factor was on the order of 2.27–2.75 times the mean wind speed. The pattern and scales of the gusts suggest that a [[mesovortex]] was embedded in the already-strong [[eyewall]] of the cyclone.<ref name="courtney">{{cite web|url=http://www.bom.gov.au/amoj/docs/2012/courtney_hres.pdf|title=Documentation and verification of the world extreme wind gust record: 113.3 m s–1 on Barrow Island, Australia, during passage of tropical cyclone Olivia|publisher=Australian Meteorological and Oceanographic Journal}}</ref> Currently{{As of when|date=June 2024}}, the second-highest surface wind speed ever officially recorded is {{cvt|103.266|m/s|km/h mph kn ft/s}} at the [[Mount Washington (New Hampshire)]] Observatory {{cvt|6288|ft|m|order=flip}} above sea level in the US on 12 April 1934, using a [[Hot-wire anemometry|hot-wire anemometer]]. The anemometer, specifically designed for use on Mount Washington, was later tested by the US [[National Weather Service|National Weather Bureau]] and confirmed to be accurate.<ref>{{cite web|url=http://www.mountwashington.org/about/visitor/recordwind.php|access-date=26 January 2010|title=The story of the world record wind|publisher=Mount Washington Observatory}}</ref> ===Tornadic=== Wind speeds within certain atmospheric phenomena (such as [[tornado]]es) may greatly exceed these values but have never been accurately measured. Directly measuring these tornadic winds is rarely done, as the violent wind would destroy the instruments. A method of estimating speed is to use [[Doppler on Wheels]] or mobile [[Doppler weather radar]]s to measure the wind speeds remotely.<ref>{{cite news|title=Massive Okla. tornado had windspeed up to 200 mph|url=http://www.cbsnews.com/news/massive-okla-tornado-had-windspeed-up-to-200-mph/|access-date=17 May 2014|newspaper=CBS News|date=20 May 2013}}</ref> Using this method, a mobile radar ([[RaXPol]]) owned and operated by the [[University of Oklahoma]] recorded winds up to {{convert|150|m/s|mph km/h}} inside the [[2013 El Reno tornado]], marking the fastest winds ever observed by radar in history.<ref name="2024RadarPaper">{{cite journal |last1=Lyza |first1=Anthony W. |last2=Flournoy |first2=Matthew D. |last3=Alford |first3=A. Addison |title=Comparison of Tornado Damage Characteristics to Low-Altitude WSR-88D Radar Observations and Implications for Tornado Intensity Estimation |journal=[[Monthly Weather Review]] |date=19 March 2024 |volume=152 |issue=8 |page=1689 |doi=10.1175/MWR-D-23-0242.1 |url=https://journals.ametsoc.org/view/journals/mwre/aop/MWR-D-23-0242.1/MWR-D-23-0242.1.xml |access-date=19 March 2024 |publisher=[[National Oceanic and Atmospheric Administration]] and [[University of Oklahoma]] via the [[American Meteorological Society]]|bibcode=2024MWRv..152.1689L }}</ref> In 1999, a mobile radar measured winds up to {{cvt|135|m/s|km/h mph kn ft/s}} during the [[1999 Bridge Creek–Moore tornado]] in [[Oklahoma]] on 3 May,<ref>{{cite web|url=http://www.spc.noaa.gov/faq/tornado/#History|title=Historical Tornadoes|publisher=National Weather Service}}</ref> although another figure of {{cvt|142|m/s|km/h mph kn ft/s}} has also been quoted for the same tornado.<ref name=worldrecordacademy>{{cite news|title=Highest surface wind speed-Tropical Cyclone Olivia sets world record|url=http://www.worldrecordacademy.com/weather/highest_surface_wind_speed_Tropical_Cyclone_Olivia_sets_world_record_101519.htm|access-date=17 May 2014|newspaper=World Record Academy|date=26 January 2010}}</ref> Yet another number used by the Center for Severe Weather Research for that measurement is {{cvt|135|+/-|9|m/s|km/h mph kn ft/s}}.<ref>{{cite web|last=Wurman|first=Joshua|author-link=Joshua Wurman|title=Doppler On Wheels|publisher=Center for Severe Weather Research|year=2007|url=http://www.cswr.org/dow/DOW.htm|url-status=dead|archive-url=https://web.archive.org/web/20110719102124/http://www.cswr.org/dow/DOW.htm|archive-date=2011-07-19}}</ref> However, speeds measured by [[Weather radar#Velocity|Doppler weather radar]] are not considered official records.<ref name=worldrecordacademy/> ===On other planets=== Wind speeds can be much higher on [[exoplanet]]s. Scientists at the University of Warwick in 2015 determined that [[HD 189733 b|HD 189733b]] has winds of {{convert|2,400|m/s|km/h kn|abbr=on}}. In a press release, the University announced that the methods used from measuring HD 189733b's wind speeds could be used to measure wind speeds on Earth-like exoplanets.<ref>{{Cite web|title=5400mph winds discovered hurtling around planet outside solar system|url=https://warwick.ac.uk/newsandevents/pressreleases/5400mph_winds_discovered/|access-date=2020-08-08|website=warwick.ac.uk}}</ref>
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