MESOSCALE DISCUSSION 1371
   NWS STORM PREDICTION CENTER NORMAN OK
   0605 PM CDT SUN JUN 28 2009
   
   AREAS AFFECTED...PORTIONS SRN GA...SERN AL...NRN FL...CENTRAL/ERN
   PANHANDLE OF FL.
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 531...
   
   VALID 282305Z - 290100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 531
   CONTINUES.
   
   BAND OF STG-SVR TSTMS -- EVIDENT AT 2245Z NEAR LINE FROM JAX...25
   NNE TLH...AGE...MAI -- SHOULD CONTINUE TO MOVE SSEWD ACROSS SRN
   PORTIONS WW AREA.  MODIFIED RAOBS AND RUC SOUNDINGS SUGGEST NARROW
   CORRIDOR OF WELL-HEATED BOUNDARY LAYER REMAINS AHEAD OF
   ACTIVITY...WITH DEW POINTS MID-UPPER 70S F CONTRIBUTING TO MLCAPE
   1500-2000 J/KG.  THIS WILL BE SUFFICIENT TO SUPPORT CONTINUED
   LIFTING OF HIGH THETAE PARCELS TO LFC ALONG LEADING WALL OF
   ASSOCIATED COLD POOL.  DAMAGING GUSTS WILL REMAIN PRIMARY
   THREAT...BUT WILL BECOME MORE SPORADIC AS ACTIVITY MOVES INTO
   SOMEWHAT MORE STABILIZED POST-SEA BREEZE AIR MASS S OF WW...WHERE
   LOSS OF STRONGEST HEATING ALSO IS REDUCING BUOYANCY WITH TIME.
   
   ISOLATED TSTMS STILL MAY OCCUR BEHIND PRIMARY ACTIVITY...ESPECIALLY
   OVER NWRN FRINGE OF WW...AND JUST NE OF WW IN SAV AREA WHERE POCKET
   OF RELATIVELY HOT/UNSTABLE BOUNDARY LAYER AIR WILL LINGER FOR
   ANOTHER COUPLE HOURS.  STG-SVR TSTMS INVOF CSG AS OF 2245S MAY MOVE
   SEWD OVER NWRN PORTIONS OF WW...BUT INTO PROGRESSIVELY DEEPER
   OUTFLOW POOL...WITH WEAKENING TREND ANTICIPATED.  COMBINED
   STABILIZING EFFECTS OF MCS OUTFLOW AND UPCOMING DIABATIC SFC COOLING
   SUGGEST SVR POTENTIAL HAS BECOME MRGL/DISORGANIZED OVER REMAINDER WW
   AREA BEHIND MCS.  PRIND WW MAY BE CLEARED OVER MOST AREAS BEHIND
   INITIAL MCS...WITH ANY REMAINING PORTIONS ALLOWED TO EXPIRE AS
   SCHEDULED AT 01Z.
   
   ..EDWARDS.. 06/28/2009
   
   
   ATTN...WFO...CHS...MLB...TBW...JAX...FFC...TAE...BMX...
   
   LAT...LON   32018460 31568441 30858408 30468247 30428164 31338160
               31998182 32328140 31958088 31738111 31288131 30958144
               30648143 30218137 29658122 29478114 29298154 29268211
               29328284 29418321 29518341 29688343 29758361 29928368
               30098401 30068426 29808461 29578502 29668516 29668537
               29908540 29698532 29888531 29978549 30118572 30308600
               31618613 31598543 31738540 31738521 31968501 32018460