MESOSCALE DISCUSSION 1987
   NWS STORM PREDICTION CENTER NORMAN OK
   0348 PM CDT THU SEP 20 2007
   
   AREAS AFFECTED...NRN FL...FAR SERN GA
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 202048Z - 202315Z
   
   A FEW STRONG STORMS ARE EXPECTED WITH AN ISOLATED BRIEF/WEAK TORNADO
   POSSIBLE.
   
   MARGINAL INSTABILITY HAS DEVELOPED ACROSS NRN FL/SRN GA WHERE SOME
   HEATING HAS TAKEN PLACE. SLIGHTLY ENHANCED LOW LEVEL SHEAR EXISTS
   ALONG DIFFERENTIAL HEATING BOUNDARY FROM SRN GA INTO FAR NRN FL
   WHERE SURFACE WINDS BACK FROM ELY TO NELY. CURRENT VWPS AND FORECAST
   SOUNDINGS INDICATING 0-1 KM SRH ON THE ORDER OF 100-200 M2/S2.
   
   LARGE SCALE CONVERGENCE ASSOCIATED WITH BROAD SURFACE LOW AS WELL AS
   SEA BREEZE WILL CONTINUE TO FOCUS STORMS OVER THE NEXT SEVERAL
   HOURS. A FEW OF THE STRONGER STORMS MAY HAVE AN INCREASED THREAT OF
   ROTATION AND PERHAPS A WEAK TORNADO AS THEY MOVE NWD INTO A STRONGER
   LOW LEVEL SHEAR ENVIRONMENT. OVERALL THREAT SHOULD DECREASE CLOSER
   TO SUNSET WHEN AIR MASS STABILIZES.
   
   ..JEWELL.. 09/20/2007
   
   
   ATTN...WFO...CHS...MLB...TBW...JAX...TAE...
   
   29108107 28658108 28658138 28698151 28928186 29198261
   29228275 29968379 30328379 30698346 30938309 31188282
   31368229 31508160 31308129 30658140