MESOSCALE DISCUSSION 0875
   NWS STORM PREDICTION CENTER NORMAN OK
   0802 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...WRN VA/WRN NC
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 333...
   
   VALID 230102Z - 230200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 333
   CONTINUES.
   
   MULTICELLULAR CONVECTIVE CLUSTERS OVER WRN VA/WRN NC WILL CONTINUE
   PROGRESSING EWD DURING THE NEXT COUPLE OF HOURS AMIDST MLCAPE VALUES
   OF 500 TO 1000 J/KG AND EFFECTIVE BULK SHEAR MAGNITUDES OF 25 TO 35
   KT. THIS WILL SUPPORT THE THREAT FOR MARGINALLY SVR HAIL AND A FEW
   DMGG WIND GUSTS. HOWEVER...THE ONSET OF NOCTURNAL COOLING WILL
   RESULT IN A STABILIZING BOUNDARY LAYER WITH TIME...CAUSING THE SVR
   THREAT TO SUBSTANTIALLY DECREASE BY THE SCHEDULED EXPIRATION TIME OF
   03Z. REGARDLESS...THE THREAT FOR MARGINALLY SVR STORMS COULD EXTEND
   ONE OR TWO TIERS OF COUNTIES EAST OF WW333 DURING THE NEXT COUPLE OF
   HOURS. THUS...THE WW MAY NEED TO BE LOCALLY EXTENDED IN SPATIAL
   COVERAGE TO ADDRESS THIS ACTIVITY.
   
   ..COHEN.. 05/23/2011
   
   
   ATTN...WFO...RNK...GSP...
   
   LAT...LON   35608161 36758111 37718055 37757983 36878014 36278054
               35358136 35608161