Tropical Storm HANNA

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TROPICAL STORM HANNA DISCUSSION NUMBER  38
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL082008
500 AM EDT SAT SEP 06 2008
 
NATIONAL WEATHER SERVICE WSR-88D RADAR DATA...AND SURFACE
OBSERVATIONS...SHOW THAT THE CENTER OF HANNA CAME ASHORE AT ABOUT
0720 UTC NEAR THE BORDER BETWEEN SOUTH CAROLINA AND NORTH CAROLINA. 
PRIOR TO LANDFALL...AN AIR FORCE RECONNAISSANCE AIRCRAFT MEASURED A
CENTRAL PRESSURE OF 983 MB...BUT FLIGHT-LEVEL AND SFMR DATA DID NOT
REVEAL ANY INCREASE IN THE WINDS...NOR DID WSR-88D RADAR
VELOCITIES.  THE INTENSITY APPEARED TO BE 55 TO 60 KT WHILE THE
CENTER WAS STILL OVER WATER...BUT NOW THAT IT IS INLAND THE MAXIMUM
WINDS HAVE PROBABLY COME DOWN TO ABOUT 50 KT.  SLIGHT WEAKENING IS
FORECAST AS HANNA WILL BE MOVING ROUGHLY PARALLEL TO THE EAST COAST
OF THE UNITED STATES DURING THE NEXT DAY OR SO.  LITTLE CHANGE IN
STRENGTH IS ANTICIPATED THEREAFTER AS HANNA BECOMES AN
EXTRATROPICAL CYCLONE NEAR OR OVER SOUTHEASTERN CANADA.

HANNA IS ROUNDING THE MID-LEVEL RIDGE OVER THE WESTERN
ATLANTIC...TURNING RIGHT AND ACCELERATING.  THE INITIAL MOTION
ESTIMATE IS ABOUT 020/19...BUT HANNA SHOULD TURN NORTHEASTWARD
WITHIN THE NEXT 24 HOURS AS IT ENTERS THE MID-LATITUDE WESTERLIES. 
THE NEW OFFICIAL FORECAST TRACK IS ADJUSTED SLIGHTLY TO THE LEFT OF
THE PREVIOUS ONE...AND IS NOW CLOSE TO A CONSENSUS OF THE
TIGHTLY-CLUSTERED MODEL SOLUTIONS. 
 
 
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      06/0900Z 34.4N  78.3W    50 KT
 12HR VT     06/1800Z 37.3N  76.7W    50 KT...INLAND
 24HR VT     07/0600Z 41.2N  72.2W    45 KT...NEAR COAST
 36HR VT     07/1800Z 45.0N  64.8W    45 KT...INLAND EXTRATROPICAL
 48HR VT     08/0600Z 48.2N  56.2W    45 KT...INLAND EXTRATROPICAL
 72HR VT     09/0600Z 50.5N  38.5W    45 KT...EXTRATROPICAL
 96HR VT     10/0600Z 54.5N  20.5W    45 KT...EXTRATROPICAL
120HR VT     11/0600Z 58.5N  11.5W    45 KT...EXTRATROPICAL
 
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FORECASTER KNABB
 
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