ZCZC MIATCDAT1 ALL TTAA00 KNHC DDHHMM TROPICAL STORM KATE DISCUSSION NUMBER 10 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 11 PM EDT SAT SEP 27 2003 ANALYSIS OF THE 21Z QUIKSCAT PASS INDICATES THAT THE WINDS IN KATE ARE AT LEAST 45 KT...AND THIS AGREES WITH THE DVORAK CLASSIFICATION OF T3.0 FROM TAFB. THE SYSTEM REMAINS UNDER SOUTHWESTERLY SHEAR WITH A PARTIALLY EXPOSED CENTER NEAR THE SOUTHWEST EDGE OF THE DEEP CONVECTION. THE INITIAL MOTION IS 340/10...ALTHOUGH RECENT IMAGERY SUGGESTS THAT THE MOTION MAY BE SLOWING FURTHER. THE FORECAST SCENARIO IS COMPLICATED. IN THE SHORT RUN...KATE SHOULD GRADUALLY RECURVE UNDERNEATH THE MID- TO UPPER-LEVEL LOW NORTH OF THE CYCLONE. HOWEVER...GLOBAL MODEL GUIDANCE SUGGESTS A COMPLEX INTERACTION OR MERGER OF KATE WITH THIS LOW IN A COUPLE OF DAYS...WITH THE RESULTANT SYSTEM TURNING WESTWARD UNDER THE LARGE MID-LEVEL ANTICYCLONE CURRENTLY NEAR 37N/53W. I AM NOT SURE WHAT RESULTS WILL BE ENTIRELY TROPICAL. THE SHIPS GUIDANCE MAKES KATE A HURRICANE IN 36 HOURS...UNDER 27 KT OF SHEAR...WHILE ON THE OTHER HAND THE GFDL DISSIPATES THE CYCLONE. THE OFFICIAL FORECAST ATTEMPTS TO FIND SOME MIDDLE GROUND BETWEEN THESE OPTIONS. WITH INCREASING SHEAR...THE OFFICIAL FORECAST WEAKENS THE CYCLONE AFTER 24 HOURS...BUT ALLOWS FOR REINTENSIFICATION FOLLOWING THE INTERACTION WITH THE UPPER LOW AND THE TURN BACK TO THE WEST. FORECASTER FRANKLIN FORECAST POSITIONS AND MAX WINDS INITIAL 28/0300Z 22.4N 44.7W 45 KT 12HR VT 28/1200Z 24.0N 45.0W 50 KT 24HR VT 29/0000Z 25.8N 44.7W 50 KT 36HR VT 29/1200Z 27.4N 43.6W 45 KT 48HR VT 30/0000Z 29.0N 42.0W 40 KT 72HR VT 01/0000Z 30.0N 40.0W 45 KT 96HR VT 02/0000Z 31.5N 40.0W 50 KT 120HR VT 03/0000Z 32.0N 42.0W 55 KT NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:59 UTC