MESOSCALE DISCUSSION 0622
   NWS STORM PREDICTION CENTER NORMAN OK
   1151 AM CDT WED APR 27 2011
   
   AREAS AFFECTED...MUCH OF SC...CNTRL/ERN NC...CNTRL/ERN VA
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 271651Z - 271815Z
   
   PORTIONS OF SC...CNTRL/ERN NC...AND CNTRL/ERN VA WILL EXPERIENCE AN
   INCREASE IN THUNDERSTORM COVERAGE DURING THE NEXT FEW HOURS. THIS
   ACTIVITY WILL POSE A SVR WEATHER RISK...AND THE AREA WILL LIKELY
   REQUIRE A WW ISSUANCE.
   
   DEEP LAYER S-SWLY FLOW RESIDES ACROSS THE SERN ATLANTIC AND MID
   ATLANTIC REGION...CHARACTERIZED BY 40 KT SLY LLJ OVERLAYED BY
   STRENGTHENING SWLY MIDLEVEL FLOW /APPROACHING 40 KT/. IN
   ADDITION...VERY MOIST BOUNDARY LAYER /SURFACE DEWPOINTS IN THE UPPER
   60S TO LOW 70S/ COINCIDES WITH STRONG DAYTIME HEATING /TEMPERATURES
   WARMING INTO THE 80S/. THE WARM/MOIST CONDITIONS ARE LEADING TO
   RAPID DESTABILIZATION AND THUNDERSTORM INITIATION. GIVEN MLCAPE
   VALUES FROM 1000-2000 J/KG...FAVORABLY STEEP LAPSE RATES...AND
   STRENGTHENING VERTICAL WIND SHEAR PROFILES /EFFECTIVE SHEAR
   INCREASING TO 35-50 KT...AND ENLARGING LOW-LEVEL HODOGRAPH
   STRUCTURE/...THE THREAT FOR DAMAGING WINDS AND LARGE HAIL WILL EXIST
   ACROSS THE AREA THIS AFTERNOON. IN ADDITION...A FEW TORNADOES WILL
   ALSO BE POSSIBLE.
   
   ..GARNER.. 04/27/2011
   
   
   ATTN...WFO...AKQ...MHX...LWX...RAH...ILM...RNK...CHS...CAE...
   GSP...
   
   LAT...LON   35658107 38147891 38127673 36527643 34697776 33018019
               33038123 34018169 35658107