ZCZC MIATCDAT2 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION TWO DISCUSSION NUMBER 3 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 11 AM EDT WED JUN 11 2003 DEEP CONVECTION HAS DIMINISHED OVER THE PAST SEVERAL HOURS AND THE SATELLITE APPEARANCE IS NOT IMPRESSIVE. SATELLITE DVORAK INTENSITY ESTIMATES FROM TAFB AND SAB REMAIN AT 35 KT...WHILE AFWA IS AT 30 KT. A RECENT QUIKSCAT PASS WAS INCONCLUSIVE AS TO WHETHER THE CYCLONE HAS STRENGTHENED TO A TROPICAL STORM...OR EVEN WHETHER THE DEPRESSION HAS A CLOSED SURFACE CIRCULATION. GIVEN THE CURRENT UNCERTAINTIES AND LACK OF CONVECTION THE OFFICIAL INTENSITY WILL REMAIN AT 30 KT FOR THIS ADVISORY. THE SYSTEM HAS ABOUT A DAY OR SO BEFORE THE VERTICAL SHEAR INCREASES SIGNIFICANTLY AND BEGINS TO WEAKEN THE CYCLONE. THE OFFICIAL FORECAST CALLS FOR DISSIPATION AFTER 96 HOURS BUT THIS MIGHT OCCUR WELL BEFORE THEN. SHOULD THE SYSTEM STAY FARTHER SOUTH THAN CURRENTLY FORECAST...IT WOULD FIND ITSELF IN A SOMEWHAT MORE FAVORABLE ENVIRONMENT AND HAVE SOMEWHAT BETTER PROSPECTS FOR STRENGTHENING. THE INITIAL MOTION ESTIMATE IS 275/17. THE TROPICAL CYCLONE IS CURRENTLY BEING STEERED BY EASTERLIES ON THE SOUTH SIDE OF A STRONG MID-LEVEL RIDGE. GLOBAL MODEL GUIDANCE...IN PARTICULAR THE NCEP GFS...SHOWS A WEAKNESS IN THE RIDGE ASSOCIATED WITH AN UPPER-TROPOSPHERIC TROUGH IN THE VICINITY OF 50W LONGITUDE. AS A RESULT...THE FORWARD SPEED IS EXPECTED TO GRADUALLY DECREASE AND THE TRACK SHOULD BEGIN TO LIFT A LITTLE NORTHWARD. HOWEVER...THE AMOUNT OF INTERACTION WITH THESE UPPER-LEVEL FEATURES DEPENDS ON HOW DEEP A CIRCULATION THE CYCLONE CAN MAINTAIN. THE OFFICIAL FORECAST HAS BEEN SHIFTED A LITTLE SOUTH OF THE PREVIOUS TRACK AND IS ALSO A BIT FASTER. FORECASTER FRANKLIN FORECAST POSITIONS AND MAX WINDS INITIAL 11/1500Z 9.8N 44.9W 30 KT 12HR VT 12/0000Z 10.2N 47.5W 30 KT 24HR VT 12/1200Z 11.0N 50.3W 35 KT 36HR VT 13/0000Z 11.7N 52.8W 30 KT 48HR VT 13/1200Z 12.5N 55.5W 25 KT 72HR VT 14/1200Z 14.0N 60.5W 25 KT 96HR VT 15/1200Z 15.5N 64.5W 25 KT...DISSIPATING 120HR VT 16/1200Z...DISSIPATED NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:55 UTC