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Tropical Depression FOUR


ZCZC MIATCDAT4 ALL
TTAA00 KNHC DDHHMM
TROPICAL DEPRESSION FOUR DISCUSSION NUMBER   2
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL042009
1100 AM EDT SUN AUG 16 2009
 
VISIBLE SATELLITE IMAGERY AND DATA FROM THE TAMPA WSR-88D INDICATE
DEVELOPING DEEP CONVECTIVE BANDING OVER THE EAST SEMICIRCLE OF THE
TROPICAL CYCLONE. IT APPEARS THAT THE WINDS ASSOCIATED WITH THE
STRONGER BANDS MAY NOT YET BE MIXING DOWN TO THE SURFACE...AS NOAA
BUOY 42036 LOCATED JUST TO THE NORTH-NORTHWEST OF THE CIRCULATION
CENTER IS REPORTING WINDS OF LESS THAN 15 KT. AIRCRAFT
RECONNAISSANCE WILL BE INVESTIGATING THE CYCLONE SHORTLY TO HELP
DETERMINE IF IT HAS BECOME A TROPICAL STORM.
 
ALTHOUGH REGIONAL UPPER-AIR SOUNDINGS AND WATER VAPOR IMAGERY
SUGGEST THAT THE THERMODYNAMIC ENVIRONMENT IS ONLY MARGINALLY
FAVORABLE...THE UPPER-LEVEL SOUTHERLY FLOW OVER THE DEPRESSION IS
QUITE DIFFLUENT. CONSEQUENTLY...THE OFFICIAL INTENSITY FORECAST
STILL REFLECTS STRENGTHENING JUST BEFORE LANDFALL. AFTER THAT
TIME...WEAKENING AND DISSIPATION IS FORECAST WITHIN 48 HOURS AS THE
SYSTEM MOVES INLAND OVER THE NORTHERN GULF COAST.
 
THE INITIAL MOTION IS 330/13. THE CYCLONE IS MOVING AROUND THE
PERIPHERY OF THE SUBTROPICAL RIDGE AND IS EXPECTED TO MAINTAIN THIS
APPROXIMATE HEADING UNTIL LANDFALL. THE OFFICIAL FORECAST IS CLOSE
TO A CONSENSUS OF A FAIRLY TIGHTLY CLUSTERED GUIDANCE SUITE.
 
ALTHOUGH THE DEPRESSION IS VERY SMALL AND HAS A LIMITED WIND
FIELD....HEAVY RAINFALL IS LIKELY NEAR THE TRACK OF THE CYCLONE
ACROSS THE FLORIDA PANHANDLE...SOUTHWESTERN GEORGIA AND SOUTHERN
ALABAMA.
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      16/1500Z 28.7N  84.6W    30 KT
 12HR VT     17/0000Z 30.2N  85.8W    50 KT
 24HR VT     17/1200Z 32.1N  87.1W    35 KT...INLAND
 36HR VT     18/0000Z 34.0N  88.2W    20 KT...DISSIPATING INLAND
 48HR VT     18/1200Z...DISSIPATED
 
$$
FORECASTER BRENNAN
 
NNNN


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Page last modified: Thursday, 31-Dec-2009 12:09:07 UTC