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HURRICANE ISAAC DISCUSSION NUMBER  39
NATIONAL WEATHER SERVICE MIAMI FL
11 PM EDT SAT SEP 30 2000
 
ISAAC IS BARELY A HURRICANE AND IS RAPIDLY UNDERGOING EXTRATROPICAL
TRANSITION.  THERE IS VERY LITTLE DEEP CONVECTION NEAR THE CENTER...
AND MAINLY DISPLACED TO THE NORTH.  MID-LEVEL DRY AIR IS WRAPPING
INTO THE SYSTEM FROM THE SOUTHWEST AND LOW-LEVEL COLD AIR
STRATOCUMULUS CLOUDS ARE BEING ENTRAINED INTO THE WESTERN
SEMICIRCLE.

INITIAL MOTION IS 055/27.  ISAAC IS CAUGHT UP IN THE STRONG
WESTERLIES...AND CONTINUED ACCELERATION TO THE NORTHEAST OR 
EAST-NORTHEAST IS EXPECTED THROUGH THE NEXT 36 HOURS.  THIS IS
CONSISTENT WITH THE PREVIOUS FORECAST TRACK AND THE VARIOUS GLOBAL
MODELS.
 
EXTRATROPICAL TRANSITION SHOULD CONTINUE AND SLOW WEAKENING IS
FORECAST AS DRY COOL AIR GRADUALLY OVERTAKES ISAAC.
 
FORECASTER STEWART
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL     01/0300Z 40.4N  46.4W    65 KTS
12HR VT     01/1200Z 42.6N  42.0W    55 KTS...BECOMING EXTRATROPICAL
24HR VT     02/0000Z 45.4N  35.5W    50 KTS...EXTRATROPICAL
36HR VT     02/1200Z 48.6N  28.3W    50 KTS...EXTRATROPICAL
 
 
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