2009-11-13_230037Tropical storms and hurricanes are warm core cyclones. IDA was a tropical cyclone until it weakened to a tropical depression and encountered a stationary front over north Florida and south Georgia. It then became a hybrid, being half warm and half cold, traveling across Georgia to the Carolina coast.
As a frontal wave, the cold front and warm front were wrapped around the circulation center. Portions of the two fronts merged forming an “occluded” front, seen as the purple line on the satellite image. Consequently the low pressure transformed from a warm, moist energy-rich storm to cold-core decaying Atlantic storm.
This weekend will see high pressure, lighter winds, and sunny skies for much of the southeastern U.S.


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