MESOSCALE DISCUSSION 0796
   NWS STORM PREDICTION CENTER NORMAN OK
   0246 PM CDT MON MAY 11 2009
   
   AREAS AFFECTED...EXTREME SRN SC...SERN GA...ERN FL PENINSULA
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 111946Z - 112045Z
   
   THE THREAT FOR ISOLATED SEVERE WIND GUSTS EXISTS DURING THE
   AFTERNOON OVER PORTIONS OF THE ERN AND SRN FL PENINSULA...AND
   EXTREME SRN SC INTO SERN GA. THE MARGINAL NATURE OF THE THREAT IS
   EXPECTED TO PRECLUDE A WW.
   
   SUBJECTIVE SURFACE ANALYSIS INDICATES SEA BREEZE BOUNDARIES OVER THE
   WRN AND ERN FL PENINSULA...WITH STRONGEST LOW LEVEL CONVERGENCE
   OCCURRING BETWEEN THESE TWO BOUNDARIES OVER CENTRAL PORTIONS OF THE
   PENINSULA. ADDITIONAL REGION OF SURFACE CONVERGENCE EXISTS OVER SERN
   GA INTO EXTREME SRN SC ALONG SYNOPTIC COLD FRONT. RECENT VISIBLE
   SATELLITE IMAGERY AND LIGHTNING DATA INDICATE THUNDERSTORM
   INITIATION TAKING PLACE WITHIN THESE CONVERGENCE ZONES...MAINLY
   ALONG THE WRN PERIPHERY OF AIRMASS CHARACTERIZED BY UPPER 60S TO LOW
   70S DEWPOINTS. THIS MOISTURE COMBINED WITH TEMPERATURES RISING
   THROUGH THE 80S IS AIDING IN THE DEVELOPMENT OF A MODERATE TO VERY
   UNSTABLE ATMOSPHERE...WITH RUC MLCAPE VALUES UP TO 2500 J/KG.
   VERTICAL WIND SHEAR PROFILES ARE FORECAST TO REMAIN RELATIVELY WEAK
   THROUGH THE AFTERNOON...FAVORING MULTICELL THUNDERSTORMS THAT WILL
   REMAIN FOCUSED ALONG LOW LEVEL BOUNDARIES AND STORM SCALE OUTFLOW
   INTERACTIONS. DUE TO THE WARM/MOIST BOUNDARY LAYER AIRMASS OVER
   LAYED BY A DEEP LAYER OF DRY MID LEVEL AIR...LARGE THETA-E
   DIFFERENCE /AOA 30 K/ WILL EXIST...FAVORING ISOLATED DAMAGING WIND
   GUSTS AND PERHAPS MARGINALLY SEVERE HAIL WITH THE STRONGER UPDRAFT
   CORES.
   
   ..GARNER.. 05/11/2009
   
   
   ATTN...WFO...CHS...MFL...MLB...TBW...JAX...FFC...
   
   LAT...LON   27058023 26548033 26408078 26498124 26778154 27048160
               28898166 32128256 32718210 32798112 32448050 32018085
               31098138 29958131 27788039 27058023