New NHC Update As Of 5:00 PM EST On Invest 91L

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1. A BROAD AND ELONGATED AREA OF LOW PRESSURE OVER THE CENTRAL GULF OF
MEXICO CONTINUES TO PRODUCE A LARGE AREA OF THUNDERSTORMS AND WINDS
TO NEAR GALE FORCE OVER THE SOUTHEASTERN GULF OF MEXICO.  SATELLITE
AND SURFACE DATA SUGGEST THAT THE CIRCULATION REMAINS POORLY
DEFINED...HOWEVER AN AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT IS
SCHEDULED TO INVESTIGATE THE DISTURBANCE THIS AFTERNOON.  ALTHOUGH
ENVIRONMENTAL CONDITIONS ARE NOT CONDUCIVE FOR SIGNIFICANT
DEVELOPMENT...THERE IS POTENTIAL FOR THIS SYSTEM TO BECOME A
TROPICAL DEPRESSION OR STORM BEFORE IT MOVES ACROSS NORTHERN
FLORIDA LATE THURSDAY OR THURSDAY NIGHT.  THIS SYSTEM HAS A HIGH
CHANCE...60 PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS.  

THIS SYSTEM HAS ALREADY PRODUCED TORRENTIAL RAINS AND FLOODING 
OVER THE EASTERN YUCATAN PENINSULA AND WESTERN CUBA.  REGARDLESS 
OF DEVELOPMENT...ADDITIONAL HEAVY RAINS AND GUSTY WINDS ARE 
EXPECTED OVER THE FLORIDA KEYS AND THE FLORIDA PENINSULA DURING
THE COUPLE OF DAYS.  ISOLATED TORNADOES ARE ALSO POSSIBLE OVER 
THE FLORIDA PENINSULA LATE TONIGHT THROUGH THURSDAY.  ADDITIONAL
INFORMATION ON THIS SYSTEM AND ITS EFFECTS CAN BE FOUND IN HIGH
SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...AND IN
PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE OFFICE OR
NATIONAL METEOROLOGICAL SERVICE.