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==Mesoscale== The following types of cyclones are not identifiable in synoptic charts. ===Mesocyclone=== {{Main|Mesocyclone}} A '''mesocyclone''' is a [[vortex]] of air, {{convert|2.0|km|mi}} to {{convert|10|km|mi}} in diameter (the [[mesoscale meteorology|mesoscale of meteorology]]), within a [[convection|convective]] storm.<ref name="MesocyloneDef">{{cite web|title=Mesocyclone|author=Glossary of Meteorology|publisher=[[American Meteorological Society]]|date=June 2000|url=http://glossary.ametsoc.org/wiki/Mesocyclone|access-date=2006-12-07|archive-date=2014-05-17|archive-url=https://web.archive.org/web/20140517225409/http://glossary.ametsoc.org/wiki/Mesocyclone|url-status=live}}</ref> Air rises and rotates around a vertical axis, usually in the same direction as low-pressure systems<ref name="skybrary.aero">{{cite web |title=Mesocyclone β SKYbrary Aviation Safety |url=https://www.skybrary.aero/index.php/Mesocyclone |website=www.skybrary.aero |access-date=13 January 2021 |archive-date=14 January 2021 |archive-url=https://web.archive.org/web/20210114104249/https://www.skybrary.aero/index.php/Mesocyclone |url-status=live }}</ref> in both northern and southern hemisphere. They are most often cyclonic, that is, associated with a localized low-pressure region within a [[supercell]].<ref name="skybrary.aero"/><ref>{{cite web|author=[[National Weather Service]] Forecast Office State College, Pennsylvania|url=http://www.erh.noaa.gov/ctp/features/2006/07_10/|title=Splitting Storm and Anti-cyclonic Rotating Mesocyclone in a Thunderstorm over Elk County July 10th, 2006|date=2006-07-16|access-date=2008-06-15|archive-date=2009-01-14|archive-url=https://web.archive.org/web/20090114220647/http://www.erh.noaa.gov/ctp/features/2006/07_10/|url-status=live}}</ref> Such storms can feature strong surface winds and severe [[hail]].<ref name="skybrary.aero"/> Mesocyclones often occur together with updrafts in [[supercell]]s, where [[tornado]]es may form.<ref name="skybrary.aero"/> About 1,700 mesocyclones form annually across the United States, but only half produce tornadoes.<ref name="FoN">Forces of Nature. [http://library.thinkquest.org/C003603/english/tornadoes/themesocyclone.shtml Tornadoes : the mesocyclone.] {{webarchive|url=https://web.archive.org/web/20080616154710/http://library.thinkquest.org/C003603/english/tornadoes/themesocyclone.shtml|date=2008-06-16}} Retrieved on 2008-06-15.</ref> ===Tornado=== {{main|Tornado}} A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or,<ref>{{cite web |title=Tornado Basics |url=https://www.nssl.noaa.gov/education/svrwx101/tornadoes/ |website=NOAA National Severe Storms Laboratory |access-date=13 January 2021 |language=EN-US |archive-date=31 August 2018 |archive-url=https://web.archive.org/web/20180831211732/https://www.nssl.noaa.gov/education/svrwx101/tornadoes/ |url-status=live }}</ref> in rare cases, the base of a cumulus cloud. Also referred to as twisters, a colloquial term in America, or cyclones, although the word cyclone is used in meteorology, in a wider sense, to name any closed low-pressure circulation. ===Dust devil=== {{main|Dust devil}} A [[dust devil]] is a strong, well-formed, and relatively long-lived whirlwind,<ref name="Dust Devils">{{cite web |title=Dust Devils |url=https://www.crystalinks.com/dustdevils.html |website=www.crystalinks.com |access-date=13 January 2021 |archive-date=25 January 2021 |archive-url=https://web.archive.org/web/20210125094338/https://www.crystalinks.com/dustdevils.html |url-status=live }}</ref> ranging from small (half a metre wide and a few metres tall) to large (more than 10 metres wide and more than 1000 metres tall).<ref name="Dust Devils"/> The primary vertical motion is upward.<ref name="Dust Devils"/> Dust devils are usually harmless, but can on rare occasions grow large enough to pose a threat to both people and property.<ref name="Dust Devils"/> ===Waterspout=== {{main|Waterspout}} A waterspout is a columnar vortex forming over water that is, in its most common form, a non-[[supercell]] [[tornado]] over water that is connected to a [[cumuliform cloud]]. While it is often weaker than most of its land counterparts, stronger versions spawned by [[mesocyclones]] do occur. ===Steam devil=== {{main|Steam devil}} A gentle vortex over calm water or wet land made visible by rising water vapour. ===Fire whirl=== {{main|Fire whirl}} A fire whirl β also colloquially known as a fire devil, fire tornado, firenado, or fire twister β is a whirlwind induced by a fire and often made up of flame or ash.
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