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The descriptor "extratropical" refers to the fact that this type of cyclone generally occurs outside of the tropics, in the middle latitudes of the planet. These systems may also be described as "mid-latitude cyclones" due to their area of formation, or "post-tropical cyclones" where extratropical transition has occurred, [ 5 ] [ 6 ] but are ...
A tropical cyclone can become extratropical as it moves toward higher latitudes if its energy source changes from heat released by condensation to differences in temperature between air masses; [20] From an operational standpoint, a tropical cyclone is usually not considered to become a subtropical cyclone during its extratropical transition. [26]
Continued weakening is expected and Helene is forecast to become extratropical later Friday, the NHC said. Tropical-storm-force winds extended outward up to 345 miles east of the center of the ...
Hurricane Cristobal (2014) in the north Atlantic after completing its transition from a hurricane to an extratropical cyclone. Tropical cyclones often transform into extratropical cyclones at the end of their tropical existence, usually between 30° and 40° latitude, where there is sufficient forcing from upper-level troughs or shortwaves ...
For people on the ground, there is little difference between a subtropical and tropical storm. Both bring high winds and potential flooding.
Comparison between extratropical and tropical cyclones on surface analysis. There are a number of structural characteristics common to all cyclones. A cyclone is a low-pressure area. [18] A cyclone's center (often known in a mature tropical cyclone as the eye), is the area of lowest atmospheric pressure in the region. [18]
Tropical wave: Also known as an easterly wave, a tropical wave is an elongated area of relatively low pressure or cyclonic curvature maximum moving east to west across the tropics. The wave can ...
As a note, tropical and subtropical cyclones are classified by National Hurricane Center as synoptic scale rather than mesoscale. [ 8 ] Features the size of an individual thunderstorm are also known somewhat informally as "storm-scale", typically meso-gamma but sometimes meso-beta [ 9 ] or microscale .