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Tropical Storm HANNA


ZCZC MIATCDAT3 ALL
TTAA00 KNHC DDHHMM
TROPICAL STORM HANNA DISCUSSION NUMBER  40
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL082008
500 PM EDT SAT SEP 06 2008
 
THE CENTER OF HANNA IS MOVING OVER THE DELMARVA PENINSULA...
WITH RADAR DATA CONTINUING TO SHOW WIDESPREAD RAINBANDS OVER THE
NORTHERN SEMICIRCLE.  HOWEVER...THE CENTRAL CONVECTION IS
DECREASING...AND THE CENTRAL PRESSURE HAS RISEN TO 994 MB.
RECENT SURFACE OBSERVATIONS HAVE SHOWN 35-40 KT SUSTAINED WINDS. 
SO...THE MAXIMUM INTENSITY IS MAINTAINED AT 45 KT ON THE PREMISE
THAT THE MAXIMUM WINDS WERE NOT SAMPLED.  AS BEFORE...WHILE LITTLE
CHANGE IN STRENGTH IS LIKELY THROUGH THE FORECAST PERIOD...HANNA IS
EXPECTED TO LOSE TROPICAL CHARACTERISTICS IN 12-24 HOURS.
 
THE INITIAL MOTION IS NOW 040/23.  HANNA IS ENTERING THE WESTERLIES
AND SHOULD ACCELERATE NORTHEASTWARD FOR THE NEXT 24-36 HR..FOLLOWED
BY A RAPID EASTWARD MOTION.  A TURN TOWARD THE NORTHEAST WITH SOME
DECELERATION IS POSSIBLE AFTER 96 HR.  THE MODEL GUIDANCE IS FAIRLY
WELL CLUSTERED AROUND THIS SCENARIO...AND THE NEW FORECAST TRACK IS
ESSENTIALLY AN UPDATE OF THE PREVIOUS TRACK.
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      06/2100Z 38.5N  75.8W    45 KT...INLAND
 12HR VT     07/0600Z 41.7N  71.8W    45 KT...INLAND
 24HR VT     07/1800Z 45.3N  64.6W    45 KT...EXTRATROPICAL
 36HR VT     08/0600Z 48.3N  56.0W    45 KT...INLAND EXTRATROPICAL
 48HR VT     08/1800Z 49.6N  47.2W    45 KT...EXTRATROPICAL
 72HR VT     09/1800Z 51.5N  31.0W    45 KT...EXTRATROPICAL
 96HR VT     10/1800Z 56.0N  17.5W    45 KT...EXTRATROPICAL
120HR VT     11/1800Z 60.0N  10.0W    45 KT...EXTRATROPICAL
 
$$
FORECASTER BEVEN
 
NNNN


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Page last modified: Tuesday, 21-Apr-2009 12:09:17 UTC