Tropical Storm HANNA

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TROPICAL STORM HANNA DISCUSSION NUMBER  39
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL082008
1100 AM EDT SAT SEP 06 2008
 
THE CENTER OF HANNA IS MOVING INTO SOUTHEASTERN VIRGINA...WITH
SATELLITE IMAGERY SHOWING A CONVECTIVE OVERCAST JUST NORTH OF THE
CENTER...AND RADAR DATA SHOWING WIDESPREAD RAINBANDS OVER THE
NORTHERN SEMICIRCLE.  WHILE THERE ARE NO RECENT OBSERVATIONS OF
SUSTAINED TROPICAL STORM-FORCE WINDS...IT IS ESTIMATED THAT THE
MAXIMUM WINDS REMAIN 45 KT IN THE EASTERN SEMICIRCLE IN AREAS NOT
CURRENTLY SAMPLED.  WHILE LITTLE CHANGE IN STRENGTH IS LIKELY
THROUGH THE FORECAST PERIOD...HANNA IS EXPECTED TO LOSE TROPICAL
CHARACTERISTICS IN ABOUT 24 HOURS.

THE INITIAL MOTION IS NOW 025/22.  HANNA IS ROUNDING THE END OF THE
WESTERN ATLANTIC RIDGE AND SHOULD ACCELERATE NORTHEASTWARD INTO THE
WESTERLIES DURING THE NEXT 24-48 HR.  AFTER THAT...THE SYSTEM
SHOULD MOVE GENERALLY EAST-NORTHEASTWARD FOR THE REMAINDER OF THE
FORECAST PERIOD.  THE MODEL GUIDANCE IS TIGHTLY CLUSTERED AROUND
THIS SCENARIO...AND NEW FORECAST TRACK IS ESSENTIALLY AN UPDATE OF
THE PREVIOUS TRACK.
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      06/1500Z 36.6N  77.4W    45 KT
 12HR VT     07/0000Z 39.7N  74.7W    45 KT...INLAND
 24HR VT     07/1200Z 43.5N  68.4W    45 KT...INLAND EXTRATROPICAL
 36HR VT     08/0000Z 46.8N  60.1W    45 KT...EXTRATROPICAL
 48HR VT     08/1200Z 49.0N  51.6W    45 KT...EXTRATROPICAL
 72HR VT     09/1200Z 51.0N  34.0W    45 KT...EXTRATROPICAL
 96HR VT     10/1200Z 55.0N  19.0W    45 KT...EXTRATROPICAL
120HR VT     11/1200Z 59.0N  10.5W    45 KT...EXTRATROPICAL
 
$$
FORECASTER BEVEN
 
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