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Tropical Storm LARRY


ZCZC MIATCDAT2 ALL
TTAA00 KNHC DDHHMM
TROPICAL STORM LARRY DISCUSSION NUMBER   5
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
5 PM EDT THU OCT 02 2003
 
VISIBLE SATELLITE IMAGERY AND REPORTS FROM AN AIR FORCE RESERVE
HURRICANE HUNTER AIRCRAFT INDICATE THAT THEW LOW-LEVEL CIRCULATION
OF LARRY HAS BECOME BETTER DEFINED DURING THE DAY.  THE AIRCRAFT
MEASURED A CENTRAL PRESSURE OF 995 MB...WITH MAXIMUM 1500-FT WINDS
OF 66 KT IN THE SOUTHWEST QUADRANT.  BASED ON THIS...THE INITIAL
INTENSITY IS INCREASED TO 50 KT.  LARRY IS STRONGER THAN ITS
SATELLITE SIGNATURE...AS SATELLITE INTENSITY ESTIMATES ARE ONLY 35
KT.

LARRY HAS DRIFTED ERRATICALLY SOUTHWARD SINCE YESTERDAY.  HOW MUCH
OF THIS IS ACTUAL MOTION AND HOW MUCH IS REFORMATION IS NOT
CERTAIN.  THE STORM REMAINS TRAPPED IN WEAK STEERING CURRENTS
BETWEEN TWO HIGH PRESSURE RIDGES...SO ANY MOTION WILL BE SLOW. 
GUIDANCE HAS COME INTO SOMEWHAT BETTER AGREEMENT ON A SLOW MOTION
BETWEEN SOUTHEAST AND SOUTHWEST...SO THE FORECAST TRACK PHILOSOPHY
WILL BE CHANGED TO THAT OF A SLOW SOUTHWARD TO SOUTH-SOUTHWESTWARD
DRIFT THROUGH THE FORECAST PERIOD.  IT SHOULD BE NOTED THAT WITH
THIS SLOW MOTION...THE POTENTIAL EXISTS FOR JUMPS IN THE POSITION
FROM ADVISORY TO ADVISORY OR AIRCRAFT FIX TO AIRCRAFT FIX.

THE CONVECTION ASSOCIATED WITH LARRY IS STILL POORLY ORGANIZED...AND
THERE IS SOME EVIDENCE OF WESTERLY VERTICAL SHEAR.  THIS
COMBINATION SHOULD SLOW THE DEVELOPMENT...AND THUS THE INTENSITY
FORECAST CALLS FOR ONLY GRADUAL STRENGTHENING.  IT IS UNCERTAIN HOW
THE STORM MAY INTERACT WITH THE MEXICAN COAST IN 24-48 HR...AND
THUS THE INTENSITY FORECAST DOES NOT CURRENTLY CALL FOR LARRY TO
BECOME A HURRICANE.  HOWEVER...THE GFDL FORECASTS LARRY TO BECOME A
HURRICANE AND THE POSSIBILITY CANNOT BE RULED OUT.
 
WIND RADII HAVE BEEN REVISED BASED ON REPORTS FROM THE HURRICANE
HUNTER.  IN THE SOUTHWEST QUADRANT...THE AIRCRAFT REPORTED 1500-FT
WINDS OF 60 KT WITHIN 30 NM OF THE COAST...WHICH DECREASED
DRASTICALLY TO 10-20 KT AT THE COAST.
 
FORECASTER BEVEN
 
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      02/2100Z 20.4N  93.6W    50 KT
 12HR VT     03/0600Z 20.1N  93.6W    50 KT
 24HR VT     03/1800Z 19.8N  93.7W    55 KT
 36HR VT     04/0600Z 19.5N  93.8W    60 KT
 48HR VT     04/1800Z 19.2N  93.9W    60 KT
 72HR VT     05/1800Z 18.5N  94.0W    60 KT
 96HR VT     06/1800Z 17.5N  94.5W    40 KT
120HR VT     07/1800Z 16.5N  95.5W    20 KT...INLAND DISSIPATING
 
 
NNNN


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Page last modified: Monday, 07-Feb-2005 16:49:59 UTC