ZCZC MIATCDEP2 ALL TTAA00 KNHC DDHHMM TROPICAL STORM BEATRIZ DISCUSSION NUMBER 6 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 8 PM PDT WED JUN 22 2005 A HEALTHY BURST OF DEEP CONVECTION HAS DEVELOPED OVER OR NEAR THE LOW-LEVEL CENTER DURING THE PAST 3 HOURS PRODUCING A NICE ROUND CDO-LIKE FEATURE. ROTATION OF THE CLOUD TOPS WOULD PLACE THE CENTER A LITTLE FARTHER SOUTH...BUT A 25 KT NORTHWEST WIND FROM SHIP 9VVY IN THE WESTERN PORTION OF THE CLOUD MASS SUGGESTS THAT THE CENTER IS NORTH OF 15.5N...BUT STILL SOUTH OF THE PREVIOUS FORECAST TRACK. AMSU MICROWAVE IMAGERY AT 22/2121Z ALSO IMPLIES A POSITION A LITTLE SOUTH OF THE PREVIOUS TRACK. THE INITIAL INTENSITY IS INCREASED TO 45 KT BASED ON DVORAK SATELLITE ESTIMATES OF 45 KT FROM BOTH TAFB AND SAB...AND A UW-CIMSS AMSU PRESSURE ESTIMATE OF 997.7 MB AT 2120Z. AFWA CAME IN WITH A 65 KT ESTIMATE...AND BEATRIZ COULD BE CLOSER TO 50 OR EVEN 55 KT NOW...BUT I WOULD PREFER TO WAIT AND SEE IF THE CDO-LIKE FEATURE PERSISTS AND IF THE LOW-LEVEL CENTER BECOMES EMBEDDED WITHIN THE CENTER OF THE CONVECTIVE CLOUD MASS. THE INITIAL MOTION ESTIMATE IS 290/12. THERE REMAINS NO SIGNIFICANT CHANGE TO PREVIOUS FORECAST TRACK REASONINGS. BEATRIZ IS EXPECTED TO MOVE WEST-NORTHWESTWARD AND GRADUALLY DECREASE IN FORWARD SPEED AS THE SUBTROPICAL RIDGE TO NORTH WEAKENS SLIGHTLY. AFTER PASSING OVER MUCH COOLER SSTS BY 36 HOURS...BEATRIZ IS FORECAST TO BEGIN A RAPID WEAKENING TREND AND THEN BE STEERED SLOWLY WESTWARD BY THE LOW-LEVEL EASTERLIES AS THE SYSTEM BECOMES VERTICALLY SHALLOW. THE OFFICIAL TRACK IS A LITTLE SOUTH...OR LEFT...OF THE PREVIOUS FORECAST AND CLOSE TO THE NHC MODEL CONSENSUS THROUGH 72 HOURS. THE LAST COUPLE OF IMAGES SINCE 00Z SUGGESTS THAT THE CENTER OF BEATRIZ MAY BE MIGRATING CLOSER TO THE CENTER OF THE CDO-LIKE FEATURE. IF THIS TREND PERSISTS...THEN IT IS POSSIBLE THAT BEATRIZ COULD PEAK IN ABOUT 18 HOURS NEAR HURRICANE STRENGTH BEFORE IT REACHES SUB-26C SSTS. THE INTENSITY FORECAST IS A LITTLE HIGHER THAN THE SHIPS MODEL...WHICH BRINGS BEATRIZ TO 52 KT IN 18 HOURS THROUGH 36 HOURS...AFTER WHICH STEADY TO RAPID WEAKENING OCCURS. FORECASTER STEWART FORECAST POSITIONS AND MAX WINDS INITIAL 23/0300Z 15.8N 107.8W 45 KT 12HR VT 23/1200Z 16.3N 109.3W 55 KT 24HR VT 24/0000Z 16.9N 111.3W 60 KT 36HR VT 24/1200Z 17.3N 113.0W 50 KT 48HR VT 25/0000Z 17.5N 114.3W 40 KT 72HR VT 26/0000Z 17.7N 116.0W 30 KT...DISSIPATING 96HR VT 27/0000Z 17.7N 117.5W 20 KT...DISSIPATING 120HR VT 28/0000Z 17.7N 119.0W 20 KT...REMNANT LOW $$ NNNN
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Page last modified: Thursday, 22-Dec-2005 17:10:25 UTC