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Unseasonably stout wave in Caribbean bringing enhanced showers and tstorms for several days, but lacks model support for development 5/26
Days since last H. Landfall - US: Any 271 (Idalia) , Major: 271 (Idalia) Florida - Any: 271 (Idalia) Major: 271 (Idalia)
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Clark
Meteorologist


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Posts: 1710
Re: Soth Atlantic Hurricane Question
      Sun Sep 26 2004 08:54 AM

The storm had extratropical origins, as a blocking pattern set up over the S. Atlantic, resulting in trough fracture and leaving a piece of energy behind in its wake off of the coast of Brazil. With marginally favorable SSTs and a sharp enough temperature difference between the sea surface and top of the troposphere (i.e. the temperatures aloft were cold enough to counteract the marginal SSTs), the system gradually converted to tropical origins much like you sometimes see tropical/subtropical storms form from remnant frontal boundaries (or even upper lows).

Normally, the water temperatures are colder than they were in March, plus the blocking pattern does not exist and storms are relatively progressive throughout the hemisphere. Upper winds are also, in general, not condusive to tropical development. It's possible, but really unlikely. But, as 2004 has proven...anything can - and does - happen.

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Subject Posted by Posted on
* Soth Atlantic Hurricane Question Keith234 Sun Sep 26 2004 08:54 AM
. * * Re: Soth Atlantic Hurricane Question Clark   Sun Sep 26 2004 08:54 AM
. * * Re: Soth Atlantic Hurricane Question Keith234   Sun Sep 26 2004 11:57 AM
. * * Re: Soth Atlantic Hurricane Question LI Phil   Sun Sep 26 2004 09:45 PM
. * * Re: Soth Atlantic Hurricane Question Clark   Sun Sep 26 2004 10:22 PM
. * * Re: Soth Atlantic Hurricane Question Keith234   Sun Sep 26 2004 10:25 PM
. * * Re: Soth Atlantic Hurricane Question LI Phil   Mon Sep 27 2004 03:01 PM
. * * Re: Soth Atlantic Hurricane Question Redbird   Tue Sep 28 2004 01:54 AM

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