Bobbi, how ULL's become Tropical
Posted by Jake on 8/19/2009, 11:02 am
Often upper level low pressure systems dive south into the Gulf of Mexico or southwest tropical or subtropical Atlantic. These can be very intense at twenty to forty thousand feet and can cause a large mass of showers and thunderstorms to form along their eastern quads. If they persist over tropical or subtropical waters they can at times begin to develop showers and thunderstorms that are more widespread and the mid and upper level low pressure begins to descend to the sea surface and form low pressure there. If t-storms persist and they are collocated with an area of surface low they can eventually become a subtropical or tropical cyclones. This process takes many days, as constant convection near the circulation core acts to heat the atmosphere and in response a LLC forms and continues to feed from convective feedback and thus a warm core cyclone develops.

Hope this helps!!
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Track is one thing, intensity forecast is another - JAC, 8/19/2009, 8:56 am
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