ZCZC MIATCDEP3 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION EIGHTEEN-E DISCUSSION NUMBER 3 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP182006 800 PM PDT THU OCT 26 2006 CONVECTION ASSOCIATED WITH THE DEPRESSION HAS BEEN ON THE DECREASE TONIGHT. THIS...ALONG WITH A LACK OF DEFINITIVE BANDING FEATURES... HAS LED TO A REDUCTION IN THE DVORAK T-NUMBERS FROM TAFB/SAB. THE CURRENT INTENSITY WILL BE KEPT AT 30 KT FOR THIS ADVISORY. THE SHIPS MODEL CONTINUES TO INSIST ON FUTURE INTENSIFICATION... WITH LIGHT WIND SHEAR AND WARM SSTS BEING THE STRONGEST POSITIVE FACTORS. HOWEVER THE GFDL DOESN'T FORECAST ANY STRENGTHENING AND INSTEAD DISSIPATES THE CYCLONE BEYOND 90 HOURS. IN LIGHT OF THE GFDL GUIDANCE... WHICH HAS BEEN A GOOD PERFORMER THIS SEASON... THE INTENSITY FORECAST HAS BEEN DIMINISHED A BIT FROM THE LAST PACKAGE... SHOWING A MORE MODEST INTENSIFICATION RATE AND A LOWER PEAK INTENSITY. THE DEPRESSION APPEARS TO BE MOVING DUE WEST TONIGHT AT ABOUT 7 KT BASED ON A 2212 UTC TRMM OVERPASS AND FIXES FROM THE VARIOUS AGENCIES. DYNAMICAL TRACK GUIDANCE FOR THIS PACKAGE IS RATHER LIMITED DUE TO MOST GLOBAL MODELS NOT PROPERLY RESOLVING THE DEPRESSION. HOWEVER... GLOBAL MODELS SUGGEST THAT MIDDLE-LEVEL RIDGING TO THE NORTHWEST OF THE CYCLONE WILL BUILD AND COULD FORCE THE SYSTEM TO MOVE WEST-SOUTHWESTWARD FOR A DAY OR TWO. THEREAFTER THE MODELS GENERALLY SHOW THIS RIDGE REMAINING INTACT FOR THE REST OF THE FORECAST. THE OFFICIAL FORECAST IS NUDGED A LITTLE SOUTH OF THE PREVIOUS ONE EARLY ON... BUT IS STILL TO THE NORTH OF MOST GUIDANCE AS WE'RE NOT READY TO TOTALLY BUY INTO A SOUTHWESTWARD MOTION. IN THE LONGER-RANGE... THE FORECAST IS SPED UP AND FARTHER SOUTH DUE TO MOST MODELS SHOWING A LITTLE MORE RIDGING THAN IN THE EARLIER RUNS. THE OFFICIAL FORECAST IS BETWEEN THE BAM MEDIUM/DEEP MODELS AND THE PREVIOUS NHC FORECAST. FORECAST POSITIONS AND MAX WINDS INITIAL 27/0300Z 16.9N 105.6W 30 KT 12HR VT 27/1200Z 16.6N 106.7W 35 KT 24HR VT 28/0000Z 16.3N 108.5W 40 KT 36HR VT 28/1200Z 16.0N 110.5W 45 KT 48HR VT 29/0000Z 16.0N 112.5W 50 KT 72HR VT 30/0000Z 16.0N 116.5W 50 KT 96HR VT 31/0000Z 16.0N 120.0W 45 KT 120HR VT 01/0000Z 16.0N 123.5W 40 KT $$ FORECASTER BLAKE/PASCH NNNN
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Page last modified: Friday, 27-Oct-2006 02:40:03 UTC