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When extratropical cyclones deposit heavy, wet snow with a snow-water equivalent (SWE) ratio of between 6:1 and 12:1 and a weight in excess of 10 pounds per square foot (~50 kg/m 2) [82] piles onto trees or electricity lines, significant damage may occur on a scale usually associated with strong tropical cyclones. [83]
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 ...
The strong temperature contrast between polar and tropical air gives rise to the largest scale atmospheric circulations: the Hadley cell, the Ferrel cell, the polar cell, and the jet stream. Weather systems in the middle latitudes , such as extratropical cyclones , are caused by instabilities of the jet streamflow.
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]
Two classes of post-tropical cyclones exist Extratropical cyclone, which is frontal, sometimes still retains winds of hurricane or tropical storm force. [1] Hurricane Paulette (2020) provides a recent example of an extratropical cyclone, [3] in which it no longer has a warm core in higher latitudes when it was over Nova Scotia and all points north in its trajectory.
Post-Tropical Cyclone Tammy: A strong extratropical cyclone (formerly Tammy) associated with an occluded front is located a few hundred miles east of Bermuda. This low is forecast to become ...
In all tropical basins, except the Northern Indian Ocean, the extratropical transition of a tropical cyclone may result in reintensification into a warm seclusion. For example, Hurricane Maria (2005) and Hurricane Cristobal (2014) each re-intensified into a strong baroclinic system and achieved warm seclusion status at maturity (or lowest ...
The strong temperature contrast between polar and tropical air gives rise to the largest scale atmospheric circulations: the Hadley cell, the Ferrel cell, the polar cell, and the jet stream. Weather systems in the middle latitudes , such as extratropical cyclones , are caused by instabilities of the jet streamflow.