MESOSCALE DISCUSSION 1275
   NWS STORM PREDICTION CENTER NORMAN OK
   0520 PM CDT MON JUN 22 2009
   
   AREAS AFFECTED...PARTS OF N/N-CNTRL/CNTRL FL
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 222220Z - 222315Z
   
   PARTS OF N FL EXTENDING SWD N-CNTRL AND PERHAPS CNTRL FL ARE BEING
   MONITORED FOR A WW.
   
   RADAR MOSAIC SHOWS PULSE-LIKE NATURE TO SEMI-ORGANIZED STORM
   CLUSTERS OF SRN AND CNTRL GA.  LINEAR EXTRAPOLATION PUTS THE SRN
   CLUSTER INTO NRN FL BY 00Z.  COMPOSITE RADAR/SURFACE ANALYSIS SHOWS
   SEVERAL BOUNDARIES...WITH AN E-COAST SEA BREEZE NEAR THE I-95
   CORRIDOR IN THE NERN QUADRANT OF THE FL PENINSULA WITH ADDITIONAL
   OUTFLOW BOUNDARIES ARCING NW-NWD INTO WRN GA.  EXPECTING FURTHER
   STRONG/POTENTIALLY SEVERE STORM DEVELOPMENT IN THE NEXT HOUR OR TWO
   OVER SWRN GA WHERE LOW LEVEL CONVERGENCE IS MAXIMIZED WITH WLY LOW
   LEVEL FLOW IMPINGING UPON SWWD MOVING OUTFLOW BOUNDARY.
   
   ALTHOUGH TEMPS HAVE WARMED INTO THE UPPER 90S TO NEAR 100 ACROSS THE
   NRN PART OF THE PENINSULA...A WEAK CAP AND SUBSIDENCE HAVE HINDERED
   CONVECTIVE INITIATION THUS FAR.  CURRENT THINKING IS ACTIVITY WILL
   HAVE TO MOVE INTO THE AREA FROM GA WITH INITIATION SUPPRESSED THE
   REMAINDER OF THE LATE AFTERNOON.  A VERY MOIST/MODERATELY UNSTABLE
   BOUNDARY LAYER IS IN PLACE S OF ONGOING STORMS MAY CONTINUE TO
   SUPPORT A BROKEN CLUSTER OF STRONG/SEVERE STORMS INTO NRN FL WITHIN
   SUB-OPTIMAL BUT ADEQUATE NNWLY FLOW ALOFT.  MAIN THREATS WILL BE
   ISOLD DMGG WINDS/MARGINALLY SEVERE HAIL.  THERE MAY BE NON-ZERO WEAK
   TORNADO POTENTIAL WITH ANY UPDRAFTS THAT PROPAGATE SSEWD ALONG
   E-COAST SEA BREEZE.
   
   ..SMITH.. 06/22/2009
   
   
   ATTN...WFO...MLB...TBW...JAX...TAE...
   
   LAT...LON   29148263 30538378 30758349 30588275 30558259 30428205
               30828188 31368169 31138141 30198144 29318132 28658095
               28238104 27908145 27948231 28538248 29148263