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| #214090 (Received by flhurricane at: 5:01 AM 06.Sep.2008) TCDAT3 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 $$ FORECASTER KNABB |
