ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM TROPICAL STORM JIMENA DISCUSSION NUMBER 4 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 8 PM PDT THU AUG 28 2003 JIMENA CONTINUES TO INTENSIFY AS INDICATED BY INCREASED BANDING OF COLD TOP CONVECTION AND AN OCCASIONAL APPEARANCE OF AN EYE LIKE FEATURE IN SATELLITE IMAGERY. IN ADDITION THE OUTFLOW PATTERN IS FAIRLY SYMMETRIC. SATELLITE INTENSITY ESTIMATES ARE 55 KT FROM TAFB...45 KT FROM SAB AND PHFO...AND 35 KT FROM AFWA. THE INITIAL INTENSITY IS 50 KT FOR THIS ADVISORY. FIXES FROM ALL THE SATELLITE AGENCIES SUGGEST THAT THE LOW LEVEL CENTER WAS FURTHER NORTH THAN PREVIOUSLY THOUGHT. THUS THE INITIAL MOTION IS ADJUSTED SLIGHTLY TO THE RIGHT OF THE PREVIOUS...295/12. JIMENA MAY ALSO BE RESPONDING TO A SHORTWAVE TROUGH PASSING BY TO THE NORTHWEST AS INDICATED IN WATER VAPOR IMAGERY. THE GLOBAL MODELS INDICATE THAT A MID-UPPER LEVEL RIDGE WILL BUILD WESTWARD AFTER THE SHORTWAVE LIFTS OUT IN 24-36 HOURS. THUS THE STORM SHOULD MOVE WEST-NORTHWEST THROUGH 36 HOURS THEN DUE WESTWARD FOR THE REMAINDER OF THE FORECAST. THIS IS IN LINE WITH THE DYNAMICAL MODELS AND THE GUNS/GUNA ENSEMBLES. THE OFFICIAL TRACK IS SLIGHTLY SOUTH OF THE PREVIOUS AND CLOSER TO THE SUITE OF DYNAMICAL MODELS. JIMENA IS CURRENTLY OVER 27-28C WATERS...AND SHOULD STAY OVER THIS TEMPERATURE FOR 24-36 HR. THEREAFTER...THE CYCLONE SHOULD BE OVER MARGINAL SSTS. UPPER-LEVEL WINDS ARE FORECAST TO REMAIN FAVORABLE BY THE LARGE-SCALE MODELS...SO THE SSTS ARE THE CONTROLLING FACTOR IN THE INTENSITY. THE INTENSITY FORECAST CALLS FOR STRENGTHENING TO A HURRICANE IN 24 HOURS...THEN MAINTAINING A STEADY STATE THROUGH THE REMIANDER OF THE FORECAST AS THE CYCLONE CROSSES THE MARGINAL SSTS. THERE IS THE POSSIBILITY OF FURTHER INTENSIFICATION AFTER 72 HOURS AS THE CYCLONE ONCE AGAIN ENCOUNTERS HIGHER SSTS SOUTH OF THE HAWAIIAN ISLANDS. FORECASTER COBB/AVILA FORECAST POSITIONS AND MAX WINDS INITIAL 29/0300Z 15.6N 133.6W 50 KT 12HR VT 29/1200Z 15.9N 135.3W 60 KT 24HR VT 30/0000Z 16.4N 137.5W 65 KT 36HR VT 30/1200Z 16.8N 139.8W 70 KT 48HR VT 31/0000Z 17.0N 142.2W 70 KT 72HR VT 01/0000Z 17.0N 147.0W 70 KT 96HR VT 02/0000Z 17.0N 152.5W 75 KT 120HR VT 03/0000Z 17.0N 158.0W 75 KT NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:57 UTC