Editing Polar vortex (section)

===Southern Hemisphere===
The [[Antarctic]] vortex of the [[Southern Hemisphere]] is a single low-pressure zone that is found near the edge of the [[Ross ice shelf]], near 160 west longitude. When the polar vortex is strong, the mid-latitude [[Westerlies]] (winds at the surface level between 30° and 60° latitude from the west) increase in strength and are persistent. When the polar vortex is weak, high-pressure zones of the mid-latitudes may push poleward, moving the polar vortex, [[jet stream]], and polar front equatorward. The jet stream is seen to "buckle" and deviate south. This rapidly brings cold dry air into contact with the warm, moist air of the mid-latitudes, resulting in a rapid and dramatic change of weather known as a "[[cold snap]]".<ref>{{cite press release |title=Stratospheric Polar Vortex Influences Winter Cold, Researchers Say |publisher=[[American Association for the Advancement of Science]] |date=December 3, 2001 |url=http://www.eurekalert.org/pub_releases/2001-12/uoia-spv120301.php|access-date=May 23, 2015}}</ref>

In [[Australia]], the polar vortex, known there as a "polar blast" or "polar plunge", is a [[cold front]] that drags air from [[Antarctica]] which brings rain showers, snow (typically inland, with [[blizzard]]s occurring in the highlands), gusty icy winds, and [[hail]] in the south-eastern parts of the country, such as in [[Victoria (state)|Victoria]], [[Tasmania]], the southeast coast of [[South Australia]] and the southern half of [[New South Wales]] (but only on the [[windward]] side of the [[Great Dividing Range]], whereas the leeward side will be affected by [[foehn wind]]s).<ref>{{cite web|title=Polar Blast Set To Hit Australia This Weekend, First in 15 Years |url=https://www.sciencetimes.com/articles/26982/20200821/polar-blast-australia-weekend-first-15-years.htm |date=21 Aug 2020|website=Science Times|access-date=25 September 2020}}</ref><ref>{{cite news|title='Twin peaks': Sydney prepares for double burst of polar chill |url=https://www.smh.com.au/environment/weather/twin-peaks-sydney-prepares-for-double-burst-of-polar-chill-20180509-p4ze7g.html |date=9 May 2018 |website=[[Sydney Morning Herald]]|access-date=25 September 2020}}</ref>