ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM TROPICAL STORM GEORGETTE DISCUSSION NUMBER 2 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2 PM PDT THU AUG 26 2004 TROPICAL DEPRESSION TEN-E CONTINUES TO BECOME BETTER ORGANIZED THIS AFTERNOON...WITH A BURST OF -85C CONVECTIVE TOPS NEAR THE CENTER AND A RAGGED OUTER BAND IN THE NORTHERN SEMICIRCLE. SATELLITE INTENSITY ESTIMATES ARE 35 KT FROM AFWA...AND 30 KT FROM SAB AND TAFB. BASED ON THE AFWA ESTIMATE AND THE IMPROVED SATELLITE SIGNATURE SINCE 18Z...THE DEPRESSION IS UPGRADED TO TROPICAL STORM GEORGETTE. THE SYSTEM CURRENTLY SHOWS GOOD CIRRUS OUTFLOW OVER THE SOUTHWESTERN SEMICIRCLE AND POOR ELSEWHERE. THE INITIAL MOTION IS A SOMEWHAT UNCERTAIN 300/12. WATER VAPOR IMAGERY AND LARGE-SCALE MODEL ANALYSES INDICATE THAT GEORGETTE IS SOUTH OF A NARROW MID/UPPER-LEVEL RIDGE AXIS ALONG 28N-30N. LARGE-SCALE MODELS FORECAST THE RIDGE TO STRENGTHEN AND BUILD WESTWARD...WHICH SHOULD CAUSE GEORGETTE TO GRADUALLY TURN MORE WESTWARD. NHC TRACK GUIDANCE GENERALLY AGREES WITH THIS SCENARIO...WITH THE DYNAMICAL GUIDANCE CALLING FOR A WESTWARD TURN AFTER 36-48 HR WHILE THE VARIOUS BAM MODELS...LBAR...AND NHC91 MOVE THE CYCLONE WEST-NORTHWESTWARD. THE OFFICIAL FORECAST FOLLOWS THE DYNAMICAL GUIDANCE WITH A WESTWARD TURN AFTER 48 HR...WHICH IS CONSISTENT WITH THE NORMAL BEHAVIOR OF EPAC CYCLONES WEAKENING OVER COLDER WATER. THE NEW FORECAST TRACK IS SHIFTED NORTH OF THE PREVIOUS TRACK DUE TO THE INITIAL POSITION AND MOTION. IT IS ALSO FASTER THAN THE PREVIOUS TRACK DURING THE FIRST 48 HR AND SLOWER THEREAFTER. UPPER-LEVEL WINDS ARE FORECAST TO BE FAVORABLE THROUGH THE FORECAST PERIOD...SO THE INTENSITY OF GEORGETTE WILL BE CONTROLLED MAINLY BY THE SEA SURFACE TEMPERATURES. THE STORM IS CURRENTLY OVER 30C SSTS...WHICH DECREASE ALONG THE FORECAST TRACK TO 26C BY 72 HR AND BELOW 25C AFTER 96 HR. BASED ON THIS...GEORGETTE IS FORECAST TO PEAK AT ABOUT 65 KT IN 48-72 HR AND THEN WEAKEN TO A DEPRESSION BY 120 HR. THE STRENGTHENING BEST AGREES WITH THE SHIPS MODEL...WHILE THE WEAKENING BEST AGREES WITH THE GFDL. FORECASTER BEVEN FORECAST POSITIONS AND MAX WINDS INITIAL 26/2100Z 15.5N 107.5W 35 KT 12HR VT 27/0600Z 16.5N 109.5W 45 KT 24HR VT 27/1800Z 17.6N 112.2W 55 KT 36HR VT 28/0600Z 18.3N 114.8W 60 KT 48HR VT 28/1800Z 18.6N 117.0W 65 KT 72HR VT 29/1800Z 19.0N 121.0W 65 KT 96HR VT 30/1800Z 19.0N 125.5W 45 KT 120HR VT 31/1800Z 19.0N 130.0W 25 KT $$ NNNN
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Page last modified: Thursday, 26-Aug-2004 20:43:27 UTC