ZCZC MIATCDEP3 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION EIGHT-E DISCUSSION NUMBER 3 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2 PM PDT SAT AUG 09 2003 TROPICAL DEPRESSION EIGHT-E HAS CHANGED LITTLE THIS AFTERNOON AND THE INNER-CORE CONVECTION HAS ACTUALLY BECOME LESS DEFINED. MICROWAVE AND CONVENTIONAL SATELLITE IMAGERY SUGGEST THAT THERE ARE MULTIPLE CIRCULATIONS ROTATING AROUND A MEAN CENTER THAT WAS USED FOR THE INITIAL POSITION ESTIMATE. THE INITIAL INTENSITY IS MAINTAINED AT 30 KT BASED ON SATELLITE INTENSITY ESTIMATES OF 35 KT AND 30 KT FROM TAFB AND SAB...RESPECTIVELY. AN AFWA SATELLITE ESTIMATE WAS NOT AVAILABLE. WHILE THERE MAY BE SOME ISOLATED PATCHES OF WINDS NEAR TROPICAL STORM FORCE...CELL TRACKING ONLY PRODUCED CELL MOTIONS OF 30 KT. THERFORE...I WOULD PREFER TO WAIT TAND SEE SOME CONSISTENCY IN THE CENTRAL CORE CONVECTION BEFORE GIVING THIS SYSTEM A NAME. THE INITIAL MOTION ESTIMATE IS 285/14. THE FORWARD MOTION AND INITIAL POSITION ESTIMATES REMAIN UNCERTAIN DUE TO THE LACK OF ANY PERSISTENT ORGANIZED CONVECTION IN THE INNER-CORE REGION. HOWEVER ...USING A MEAN CENTER POSITION STILL INDICATES THAT THE CYCLONE IS GAINING LATITUDE. OTHERWISE...THERE IS NO SIGNIFICANT CHANGE TO THE PREVIOUS TRACK FORECAST OR REASONING. THE CYCLONE SHOULD CONTINUE TO MOVE WEST TO SLIGHTLY WEST-NORTHWESTWARD THROUGHOUT THE PERIOD AT SPEEDS SLIGHTLY FASTER THAN THE GLOBAL MODELS ARE NOW INDICATING. THIS IS DUE TO LARGE CIRCULATION OF THE CYCLONE ADDING SOME BETA-DRIFT MOTION TO THE MEAN STEERING FLOW. THE SHIPS INTENSITY MODEL REMAINS CONSISTENT WITH BRINGING THE CYCLONE UP TO HURRICANE STRENGTH IN 60 HOURS AND PEAKING AT 68 KT IN 72 HOURS. SINCE THE SHEAR IS EXPECTED TO REMAIN LOW WITH SSTS ABOVE 27C...SLOW BUT STEADY INTENSIFICATION IS FORECAST THROUGH 48 HOURS. UNLIKE TROPICAL STORM GUILLERMO...THIS CYCLONE WILL BE CLOSER TO THE COOLER SSTS...AND THIS IS THE MAIN REASON FOR THE SLIGHT DECREASE IN INTENSITY IN THE LATER PERIODS. FORECASTER STEWART FORECAST POSITIONS AND MAX WINDS INITIAL 09/2100Z 14.1N 114.6W 30 KT 12HR VT 10/0600Z 14.5N 116.6W 40 KT 24HR VT 10/1800Z 15.1N 119.4W 50 KT 36HR VT 11/0600Z 15.5N 122.0W 60 KT 48HR VT 11/1800Z 15.9N 124.7W 65 KT 72HR VT 12/1800Z 16.2N 129.5W 65 KT 96HR VT 13/1800Z 16.5N 135.0W 60 KT 120HR VT 14/1800Z 16.5N 140.0W 55 KT NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:57 UTC