MESOSCALE DISCUSSION 1208
   NWS STORM PREDICTION CENTER NORMAN OK
   0200 PM CDT THU JUN 18 2009
   
   AREAS AFFECTED...FL PENINSULA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 463...
   
   VALID 181900Z - 182000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 463
   CONTINUES.
   
   THE THREAT FOR MAINLY DAMAGING WINDS IS EXPECTED TO CONTINUE THROUGH
   THE AFTERNOON FOR WW 463. EARLY AFTERNOON SURFACE OBSERVATIONS
   INDICATE STRONG HEATING IS OCCURRING OVER THE FL PENINSULA...IN THE
   MIDST OF UPPER 60S TO LOWER 70S DEWPOINTS. THESE SURFACE CONDITIONS
   ARE AIDING IN THE DEVELOPMENT OF STRONG INSTABILITY /MLCAPE VALUES
   AOA 3000 J PER KG/. MEANWHILE...THE CLUSTER OF THUNDERSTORMS WHICH
   INITIATED OVER NRN FL EARLIER DURING THE DAY HAVE DEVELOPED A WELL
   DEFINED SURFACE COLD POOL /CHARACTERIZED BY TEMPERATURE IN THE LOW
   70S/...WHICH HAS RAPIDLY EXPANDED SWD INTO THE N-CENTRAL PENINSULA
   WITHIN A DEEP LAYER OF NLY TROPOSPHERIC FLOW. HI RES RADAR IMAGERY
   HAS SHOWN NEW STORM DEVELOPMENT OCCURRING READILY ALONG THE SWD
   MOVING GUST FRONT. THIS PROPAGATIONAL TREND IS EXPECTED TO CONTINUE
   GIVEN THE VERY WARM/MOIST BOUNDARY LAYER AND LARGE CAPE
   ENVIRONMENT...WITH THE PRIMARY SEVERE WEATHER THREAT BEING DAMAGING
   DOWNBURST WINDS.
   
   ..GARNER.. 06/18/2009
   
   
   ATTN...WFO...MFL...MLB...TBW...JAX...TAE...
   
   LAT...LON   30648330 30668297 30258283 30088211 29378199 29478080
               25888035 25908262 30648330