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A subtropical cyclone is a Weather system that has some characteristics of a Tropical Cyclone and some characteristics of an Extratropical Cyclone . They can form in a wide band of Latitude , from the Equator to 50°. TYPES Upper-level low The most common type of subtropical storm is an upper-level cold low with circulation extending to the surface layer and maximum sustained winds generally occurring at a radius of about 100 miles or more from the centre. In comparison to tropical cyclones, such systems have a relatively broad zone of maximum winds that is located farther from the centre, and typically have a less symmetric wind field and distribution of convection. Mesoscale low A second type of subtropical cyclone is a mesoscale low originating in or near a frontolyzing zone of horizontal wind shear, with radius of maximum sustained winds generally less 30 miles. The entire circulation may initially have a diameter of less than 100 miles. These generally short-lived systems may be either cold core or warm core. Transition from extratropical By gaining tropical characteristics, an Extratropical Low may transit into a subtropical depression/storm. A subtropical depression/storm may further gain tropical characteristics to become a pure '''tropical depression/storm''', which may eventually develop into a Hurricane , and there is at least one case of a Tropical Storm transforming into a subtropical storm. (Generally however, a tropical storm or Tropical Depression is not called subtropical while it is becoming Extratropical , after hitting either land or colder waters.) CHARACTERISTICS These storms can have maximum is a tropical or subtropical storm. Subtropical cyclones are also somewhat more likely than tropical cyclones to form outside of a region's designated Hurricane Season , as was the case with Subtropical Storm Ana (which became Tropical Storm Ana ) in mid-April of the 2003 Hurricane Season . NAMING In , from the 2004 Atlantic Hurricane Season was the first subtropical storm that did not become tropical since the policy change. A subtropical storm from the 2005 Atlantic Hurricane Season also did not become tropical, but was not named since it was not discovered until post-season analysis. SEE ALSO EXTERNAL LINKS |
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