ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION TEN-E DISCUSSION NUMBER 11 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 8 AM PDT WED SEP 14 2005 THE DEPRESSION REMAINS UNIMPRESSIVE-LOOKING ON SATELLITE IMAGERY. DVORAK CLASSIFICATIONS FROM THE THREE AGENCIES SUPPORT TROPICAL STORM STRENGTH...HOWEVER BOTH TAFB AND AFWA LOWERED THE T-NUMBER AT 12Z. DEEP CONVECTION REMAINS LIMITED...SO THE SYSTEM IS NOT UPGRADED AT THIS TIME. VERTICAL SHEAR IS FORECAST TO BE LESS THAN 10 KT THROUGH 96 HOURS...WHICH WOULD FAVOR A STEADY INCREASE IN STRENGTH. HOWEVER THE BUOYANCY TERM IN THE SHIPS OUTPUT SUGGESTS THAT A STABLE AIR MASS MAY IMPEDE INTENSIFICATION OVER THE NEXT SEVERAL DAYS. THE OFFICIAL WIND SPEED FORECAST IS CLOSE TO SHIPS AND THE PREVIOUS NHC FORECAST. INITIAL MOTION IS JUST SOUTH OF WEST...260/11. A MID-TROPOSPHERIC RIDGE...WITH AN AXIS EXTENDING WESTWARD FROM MEXICO OVER THE EASTERN PACIFIC ALONG 20-25N LATITUDE...SHOULD CONTINUE TO BE THE PRIMARY STEERING FEATURE FOR THE TROPICAL CYCLONE OVER THE NEXT SEVERAL DAYS. BY DAYS 4-5...GLOBAL MODEL GUIDANCE SHOWS A WEAKENING OF THE RIDGE JUST WEST OF 140W. THEREFORE THE OFFICIAL FORECAST TRACK MAINTAINS A MOSTLY WESTWARD MOTION THROUGH DAY 3... WITH A SLIGHT TURN TO THE WEST-NORTHWEST ALONG WITH SOME SLOWING OF THE FORWARD SPEED THEREAFTER. THIS IS NOT TOO DISSIMILAR TO THE PREVIOUS OFFICIAL TRACK...AND ALONG THE LINES OF THE GFDL/UKMET/ NOGAPS/GFS CONSENSUS. FORECASTER PASCH FORECAST POSITIONS AND MAX WINDS INITIAL 14/1500Z 13.9N 126.1W 30 KT 12HR VT 15/0000Z 13.8N 127.8W 35 KT 24HR VT 15/1200Z 13.6N 130.5W 40 KT 36HR VT 16/0000Z 13.4N 133.2W 45 KT 48HR VT 16/1200Z 13.3N 135.7W 50 KT 72HR VT 17/1200Z 13.5N 140.0W 60 KT 96HR VT 18/1200Z 14.5N 144.0W 60 KT 120HR VT 19/1200Z 15.5N 147.5W 55 KT $$ NNNN
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Page last modified: Wednesday, 14-Sep-2005 14:40:19 UTC