MESOSCALE DISCUSSION 1216
   NWS STORM PREDICTION CENTER NORMAN OK
   0533 PM CDT THU JUN 18 2009
   
   AREAS AFFECTED...PARTS OF THE SWRN FL PENINSULA / MIDDLE-LOWER KEYS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 463...
   
   VALID 182233Z - 182330Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 463
   CONTINUES.
   
   SEVERE THREAT WILL LIKELY LINGER BEYOND 23Z ACROSS PARTS OF THE SWRN
   FL PENINSULA AND PERHAPS THE MIDDLE AND LOWER KEYS.  MAIN THREATS
   WITH THIS ACTIVITY WILL BE MARGINALLY SEVERE DMGG WIND GUSTS.
   
   RADAR MOSAIC IMAGERY AT 2225Z SHOWS A QUASI-LINEAR CLUSTER OF
   STRONG/SEVERE STORMS FROM LAKE OKEECHOBEE WWD TO FMY.  THIS STORM
   COMPLEX HAS LIKELY BEEN AIDED BY A CONVECTIVELY ENHANCED VORTICITY
   MAXIMA NOW CENTERED JUST NW OF THE SPACE COAST...PER RECENT WATER
   VAPOR IMAGERY/RUC OBJECTIVE FIELDS MOVING SSWWD ON THE ERN PERIPHERY
   OF SRN MS RIVER VALLEY UPPER RIDGE.  KPGD SURFACE OBSERVATION AT
   2221Z DISPLAYED A PEAK WIND GUST TO 44 KTS WITH KFMY RECENTLY
   SHOWING AT PEAK GUST TO 41 KTS AT 2228Z.  WITH A VERY MOIST AND
   MODERATELY UNSTABLE AIRMASS S OF FORWARD PROPAGATING CONVECTIVE
   CLUSTER...EXPECT STORMS TO GENERALLY MAINTAIN THEIR INTENSITY AND
   POSE MAINLY AN ISOLD DMGG WIND THREAT.  AT THE LEAST...A LOCAL
   EXTENSION-IN-TIME FOR 1 TO 2 HOURS MAY BE NECESSARY FOR PARTS OF S
   FL COUNTIES IN WW 463 /HENDRY-COLLIER/.
   
   ..SMITH.. 06/18/2009
   
   
   ATTN...WFO...MFL...MLB...KEY...TBW...
   
   LAT...LON   24458194 26388257 26968248 27088229 26898199 26748177
               26958152 27178123 27208092 26908064 26658055 25768065
               25138083 24628106 24448135 24378159 24458194