MESOSCALE DISCUSSION 1285
   NWS STORM PREDICTION CENTER NORMAN OK
   1021 AM CDT TUE JUN 23 2009
   
   AREAS AFFECTED...WRN FLORIDA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 495...
   
   VALID 231521Z - 231715Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 495
   CONTINUES.
   
   SKIES ARE CLEARING RAPIDLY BEHIND THE MORNING CONVECTION...WITH A
   DISTINCT OUTFLOW BOUNDARY ACROSS WRN FL. A VERY MOIST AND UNSTABLE
   AIR MASS REMAINS ALONG AND W OF THIS OUTFLOW...AND EVEN THE OUTFLOW
   ITSELF IS EXPECTED TO DESTABILIZE FURTHER. THE 12Z TBW SOUNDING
   SHOWS OVER 4000 J/KG MLCAPE WHEN MODIFIED FOR CURRENT CONDITIONS.
   
   GPS WATER VAPOR OBSERVATIONS CONTINUE TO SHOW PRECIPITABLE WATER
   VALUES OVER 2.00 INCHES. IN ADDITION...WATER VAPOR IMAGERY SHOWS A
   RELATIVE MOIST PLUME EXTENDING SEWD OUT OF SRN AL/GA INTO FL.
   THUS...WITH CONTINUED DAYTIME HEATING...VIGOROUS UPDRAFTS ARE
   EXPECTED TO FORM ALONG THE OUTFLOW BOUNDARY/SEA BREEZE...WITH STORMS
   MOVING IN A SWD DIRECTION. WHILE DAMAGING WIND GUSTS WILL BE THE
   PRIMARY THREAT...THERE IS SOME THREAT OF A BRIEF TORNADO ALONG THE
   OUTFLOW BOUNDARY WHERE ENHANCED LOW LEVEL VORTICITY MAY EXIST.
   
   ..JEWELL.. 06/23/2009
   
   
   ATTN...WFO...MFL...MLB...TBW...JAX...
   
   LAT...LON   29088279 28998217 28598164 27868150 26828138 25698084
               25198117 25778175 26608235 27448277 27858293 28298284
               28758273 29088279