Extratropical cyclones are large scale low pressure weather systems that occur in the middle latitudes of the Earth. These types of cyclones produce rapid changes in temperature and dew point along broad lines, called weather fronts, about the center of the cyclone. Between the 30th and 70th parallels, there are an average of 37 cyclones in existence during any 6-hour period. Hurricane cyclones most likely to form in the northern Atlantic and northern Pacific oceans in the months of December and January.
About Extratropical cyclone in brief
Extratropical cyclones are large scale low pressure weather systems that occur in the middle latitudes of the Earth. These types of cyclones produce rapid changes in temperature and dew point along broad lines, called weather fronts, about the center of the cyclone. A study in the Southern Hemisphere shows that between the 30th and 70th parallels, there are an average of 37 cyclones in existence during any 6-hour period. Hurricane cyclones most likely to form in the northern Atlantic and northern Pacific oceans in the months of December and January. On December 14, 1986, an extratical cyclone near Iceland deepened to 920 millibars, which is a level equivalent to a category 5 hurricane. In the Arctic, the average pressure for cyclones during the winter is 1,000 millibar, and 1,100 millibARS for cyclone-force cyclones. The stronger the upper level divergence over thecyclone, the the deeper the extratropicals can become, and the more powerful they can be. The term ‘cyclone’ applies to numerous types of low pressure areas, one of which is the extraterrestrial cyclone, sometimes called a ‘mid-latitude’ cyclone or ‘wave’ Cyclones can produce anything from cloudiness and mild showers to heavy gales, thunderstorms, blizzards, and tornadoes. They can become barotropic late in their life cycle, when the distribution of heat around the cyclones becomes fairly uniform with its radius.
They are classified as baroclinic, because they form along zones of temperature andDewpoint gradient known as frontal zones. They form along linear bands of temperaturedewpoint gradient with significant vertical wind shear, so they are called ‘baroclinics’ The average number of extratopicalcyclones in the Northern Hemisphere each winter is about 234, according to one study. The average amount of time a tropical cyclone spends in the southern hemisphere is about three days. The longest extratrops last is about two weeks, from September to October. The maximum number of days a tropicalcyclone lasts is three weeks, between September and October. It is the longest time a tropical cyclone stays in the mid-latitudes, between 30° and 40° latitude. It can become post-tropical if it has intruded into the mid latitudes, or if it is a tropical cyclone that has left the tropical tropics in the middle latitudes. The average number of tropical cyclones that form during the summer is about 30, but it can be as high as 40, or as low as 20, during the fall. The most common time to form a post-tropic cyclone is in the late summer and early autumn, when there is sufficient upper-level troughs or troughs from tropical cyclones to force a short-wave trough or trough.
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This page is based on the article Extratropical cyclone published in Wikipedia (as of Dec. 05, 2020) and was automatically summarized using artificial intelligence.
