ZCZC MIATCDEP1 ALL TTAA00 KNHC DDHHMM TROPICAL DEPRESSION ONE-E DISCUSSION NUMBER 2 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 2 AM PDT TUE MAY 20 2003 TROPICAL DEPRESSION ONE-E IS LOOKING MORE HEALTHY THIS MORNING... WITH A PERSISTENT AREA OF COLD CONVECTIVE TOPS NEAR THE CENTER AND THE BEGINNING OF AN OUTER BAND IN THE SOUTHWEST QUADRANT. THE BIG QUESTION IS WHERE EXACTLY IS THE LOW-LEVEL CENTER? IF THE CENTER IS NEAR WHERE THE CONVECTIVE CURVATURE SUGGESTS... THEN THE CYCLONE IS FARTHER SOUTH THAN PREVIOUSLY THOUGHT AND IS LIKELY A TROPICAL STORM IN AGREEMENT WITH THE INTENSITY ESTIMATE FROM TAFB. HOWEVER...TWO SSM/I OVERPASSES HINT THAT THE CENTER IS ACTUALLY PARTLY EXPOSED TO THE WEST OR NORTHWEST OF THE PRIMARY CONVECTION. THE INITIAL POSITION WILL COMPROMISE BETWEEN THE NORTHERN AND SOUTHERN EXTREMES...AND THE INITIAL INTENSITY WILL REMAIN 30 KT IN AGREEMENT WITH ESTIMATES FROM SAB AND AFWA. THE CYCLONE SEEMS TO BE MOVING A LITTLE FASTER...AND THE INITIAL MOTION IS NOW 270/10. WATER VAPOR IMAGERY SHOWS A SUBSTANTIAL MID/UPPER-LEVEL ANTICYCLONE NORTH OF THE DEPRESSION...WHICH SHOULD KEEP THE SYSTEM ON A BASICALLY WESTWARD TRACK FOR 12-24 HR. AFTER THAT...LARGE-SCALE MODELS FORECAST THE ANTICYCLONE TO SLOWLY WEAKEN...WHICH SHOULD ALLOW A MORE WEST- NORTHWESTERLY MOTION FOR THE DEPRESSION. NHC GUIDANCE GENERALLY AGREES WITH THE DIRECTION...BUT THERE IS CONSIDERABLE SPREAD IN THE SPEED OF MOTION BETWEEN THE FAST GFS AND BAMD AND THE SLOW GFDL AND NHC91. THE OFFICIAL FORECAST IS SLIGHTLY LEFT OF AND NOTABLY FASTER THAN THE PREVIOUS PACKAGE...BUT NOT AS FAST AS THE GFS AND BAMS. THE CYCLONE CURRENTLY HAS FAIR TO GOOD OUTFLOW IN ALL DIRECTIONS...AND IF CURRENT TRENDS CONTINUE IT SHOULD BECOME A TROPICAL STORM LATER TODAY. LARGE-SCALE MODELS INDICATE GENERALLY FAVORABLE UPPER-LEVEL WINDS THROUGH 48-72 HR...WITH SOME INCREASE IN SHEAR POSSIBLE AFTERWARDS AS THE CYCLONE MOVES INTO COOLER WATER. THE INTENSITY FORECAST THUS CALLS FOR STEADY STRENGTHENING THROUGH 48 HR AND WEAKENING AFTER 72 HR IN AGREEMENT WITH THE SHIPS MODEL. ONE POTENTIAL INHIBITING FACTOR IS A LARGE AREA OF MID/UPPER-LEVEL DRY AIR SEEN IN WATER VAPOR IMAGERY JUST NORTHWEST OF THE DEPRESSION. SHOULD THIS AIR ENTRAIN INTO THE CYCLONE IT COULD SLOW OR PREVENT DEVELOPMENT. FORECASTER BEVEN FORECAST POSITIONS AND MAX WINDS INITIAL 20/0900Z 9.7N 104.7W 30 KT 12HR VT 20/1800Z 9.8N 106.0W 35 KT 24HR VT 21/0600Z 10.1N 107.7W 45 KT 36HR VT 21/1800Z 10.6N 109.6W 50 KT 48HR VT 22/0600Z 11.1N 111.6W 55 KT 72HR VT 23/0600Z 12.0N 116.0W 55 KT 96HR VT 24/0600Z 13.5N 120.5W 45 KT 120HR VT 25/0600Z 14.5N 125.0W 35 KT NNNN
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Page last modified: Monday, 07-Feb-2005 16:49:55 UTC