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Australian east coast low
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Australian east coast low : ウィキペディア英語版
Australian east coast low

Australian east coast lows (known locally as east coast lows and sometimes as east coast cyclones) are extratropical cyclones, the most intense of these systems have many of the characteristics of subtropical cyclones. They develop between 25˚ south and 40˚ south and within 5˚ of the Australian coastline,〔 typically during the winter months. Each year there are about ten "significant impact" maritime lows.〔(【引用サイトリンク】url=http://www.bom.gov.au/nsw/sevwx/facts/ecl.shtml )
Prior to the introduction of satellite imagery in the early 1960s, many east coast lows were classified as tropical cyclones. These storms which mostly affect the south east coast should not be confused with Australian region tropical cyclones which typically affect the northern half of the continent.
==Characterisation==
Explosive cyclogenesis is seen on average just once per year, but these storms cause significant wind and flood damage when they occur.〔 Australian east coast cyclones vary in size from mesoscale (approximately ) to synoptic scale (approximately ).
Australian east coast cyclones, although variable in size and intensity, are typically characterised by widespread heavy rainfall.〔 These storms usually occur along the subtropical east coast of Australia from Gladstone in Queensland to the Victoria/New South Wales border, and often affect large populated cities such as Sydney and Brisbane, between which over one-third of the Australian population resides.〔 Rain associated damages attributed to east coast cyclones are estimated in millions to tens of million dollars annually and are a major contributor to the total weather-associated insurance losses for all of Australia.〔 Seven per cent of all major Australian disasters since 1967 can be directly attributed to east coast cyclones.〔 Australian east coast lows often intensify rapidly overnight making them one of the more dangerous weather systems to affect the New South Wales coast.〔

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