ZCZC MIATCDEP3 ALL TTAA00 KNHC DDHHMM TROPICAL STORM FRANK DISCUSSION NUMBER 10 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2 AM PDT WED AUG 25 2004 SATELLITE INTENSITY T-NUMBERS HAVE DROPPED TO 45 KT FROM TAFB AND SAB...35 KT FROM AFWA AND 54 KT FROM AN AMSU INTENSITY ESTIMATE. THEREFORE...INITIAL INTENSITY IS REDUCED TO 50 KT. CORE CONVECTION HAS WEAKENED CONSIDERABLY...WITH REMAINING WEAK BANDING CONFINED TO THE SOUTHEAST QUADRANT. SATELLITE ANIMATION DEPICTED THAT DEEP CONVECTION PREVIOUSLY OVER THE NORTHWEST QUADRANT HAS COMPLETELY DISSIPATED. TROPICAL STORM FRANK SHOULD CONTINUE TO WEAKEN AS THE TROPICAL CYCLONE MOVES OVER COOLER WATERS. THE INTENSITY FORECAST REMAINS FAIRLY CONSISTENT WITH THE PREVIOUS ADVISORY...AND THE SHIPS AND GFDL MODELS. GLOBAL MODELS ALSO SUGGEST WEAKENING TO AN OPEN TROUGH BY THE 48 HOUR PERIOD. INITIAL MOTION IS WEST-NORTHWEST OR 285 DEGREES AT 8 KT. A TURN TO THE WEST DURING THE NEXT 12 TO 18 HOURS IS EXPECTED. GLOBAL MODELS ARE CONSISTENT IN THIS FORECAST MOTION AS A MID LEVEL RIDGE BUILDS IN FROM THE NORTHWEST BEHIND A LIFTING TROUGH OVER BAJA. WATER VAPOR ANIMATION DEPICTS THAT THE TROUGH HAS ALREADY BEGUN TO LIFT NORTHEAST. THE LOW LEVEL REFLECTION OF THE RIDGE SHOULD PROVIDE A WESTWARD STEERING FLOW THROUGH THE REMAINDER OF THE FORECAST AS THE SYSTEM CONTINUES TO WEAKEN. THE FORECAST IS SIMILAR TO THE PREVIOUS TRACK AND AGREES WITH THE GLOBAL MODEL CONSENSUS. FORECASTER ROBERTS/AVILA FORECAST POSITIONS AND MAX WINDS INITIAL 25/0900Z 22.1N 116.7W 50 KT 12HR VT 25/1800Z 22.5N 117.9W 40 KT 24HR VT 26/0600Z 22.8N 119.4W 30 KT 36HR VT 26/1800Z 22.9N 120.9W 25 KT 48HR VT 27/0600Z 23.0N 122.5W 25 KT...DISSIPATING 72HR VT 28/0600Z 23.0N 125.5W 20 KT...REMNANT LOW 96HR VT 29/0600Z 23.0N 128.5W 20 KT...REMNANT LOW 120HR VT 30/0600Z 23.0N 132.0W 20 KT...REMNANT LOW $$ NNNN
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Page last modified: Wednesday, 25-Aug-2004 08:43:14 UTC