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Catastrophic and life-threatening impacts are now underway. May everyone be safe. 140 MPH Cat 4 Hurricane Helene #FLwx #GAwx #SCwx #NCwx
Days since last H. Landfall - US: Any 0 (Helene) , Major: 0 (Helene) Florida - Any: 0 (Helene) Major: 0 (Helene)
Helene
ADV#17A 2:00 pm EDT
36.6N 84.6W
Wind: 35MPH
Pres: 982mb
Moving:
Nnw at 28 mph
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Hur Isaac
ADV#6 5:00 am EDT
37.0N 48.5W
Wind: 75MPH
Pres: 981mb
Moving:
E at 12 mph
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TS Joyce
ADV#1 11:00 am EDT
18.1N 42.9W
Wind: 40MPH
Pres: 1006mb
Moving:
Nw at 13 mph
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Clark
Meteorologist


Reged:
Posts: 1710
Re: Soth Atlantic Hurricane Question
      Sun Sep 26 2004 04:54 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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Entire topic
Subject Posted by Posted on
* Soth Atlantic Hurricane Question Keith234 Sun Sep 26 2004 04:54 AM
. * * Re: Soth Atlantic Hurricane Question Clark   Sun Sep 26 2004 04:54 AM
. * * Re: Soth Atlantic Hurricane Question Keith234   Sun Sep 26 2004 07:57 AM
. * * Re: Soth Atlantic Hurricane Question LI Phil   Sun Sep 26 2004 05:45 PM
. * * Re: Soth Atlantic Hurricane Question Clark   Sun Sep 26 2004 06:22 PM
. * * Re: Soth Atlantic Hurricane Question Keith234   Sun Sep 26 2004 06:25 PM
. * * Re: Soth Atlantic Hurricane Question LI Phil   Mon Sep 27 2004 11:01 AM
. * * Re: Soth Atlantic Hurricane Question Redbird   Mon Sep 27 2004 09:54 PM

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