MESOSCALE DISCUSSION 1740
   NWS STORM PREDICTION CENTER NORMAN OK
   0554 PM CDT FRI JUL 31 2009
   
   AREAS AFFECTED...SERN VA...CNTRL/ERN NC
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 645...
   
   VALID 312254Z - 010000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 645
   CONTINUES.
   
   THREAT FOR DMGG WINDS CONTINUES FOR WW645.
   
   SEVERAL LINES OF CONVECTION HAVE PROGRESSED EWD AHEAD OF AN UPPER
   TROUGH AND ASSOCIATED SURFACE COLD FRONT. VAD WIND PROFILE DATA
   REFLECTS UNIDIRECTIONAL WIND FIELDS...WHICH GIVEN STEEP LOW LEVEL
   LAPSE RATES WILL CONTINUE TO SUPPORT OCCASIONAL/SHORT-LIVED BOWING
   SEGMENTS CAPABLE OF PRODUCING DMGG WINDS. ACROSS FAR ERN PORTIONS OF
   THE WW...THE SEA BREEZE HAS PROGRESSED WELL INLAND AND HAS CONVERGED
   WITH EARLIER CONVECTION. STRONG CONVERGENCE/LIFT ALONG THE SEA
   BREEZE FRONT MAY LOCALLY ENHANCE UPDRAFT STRENGTH...WITH HAIL/DMGG
   WINDS POSSIBLE. HOWEVER...THE STABLE MARINE AIR IN LOW LEVELS MAY
   SOMEWHAT LIMIT DMGG WIND POTENTIAL AS THE STORMS PROGRESS EAST OF
   THE WATCH.
   
   ..HURLBUT.. 07/31/2009
   
   
   ATTN...WFO...AKQ...MHX...LWX...RAH...RNK...
   
   LAT...LON   38237510 35717682 34867770 35087909 35857970 36737882
               38357591 38237510