MESOSCALE DISCUSSION 1584
   NWS STORM PREDICTION CENTER NORMAN OK
   0644 PM CDT MON JUL 11 2011
   
   AREAS AFFECTED...S-CNTRL/SERN PA...MUCH OF MD...ERN WV...NRN VA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 631...
   
   VALID 112344Z - 120045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 631
   CONTINUES.
   
   COLD POOL CONTINUES TO MOVE E AT AROUND 30 KT ACROSS CNTRL PA...WRN
   MD...ERN WV AND WRN PORTIONS OF NRN VA. AS IT ENCOUNTERS INCREASING
   INSTABILITY...CHARACTERIZED BY MLCAPE VALUES NEAR 2000 J/KG...STORM
   REGENERATION MAY TAKE PLACE. GIVEN 30+ KT MIDLEVEL WLYS
   OVERSPREADING THE COLD POOL...THREAT FOR DAMAGING WIND GUSTS WOULD
   EXIST WITH ANY NEW STORM DEVELOPMENT. FARTHER E...SCATTERED
   THUNDERSTORMS ARE ONGOING FROM S-CNTRL PA INTO NRN VA. THESE STORMS
   WILL CONTINUE TO POSE A THREAT FOR DAMAGING WIND GUSTS AND LARGE
   HAIL THROUGH THE EVENING. IT IS UNCERTAIN WHETHER THIS ACTIVITY WILL
   MAINTAIN INTENSITY AS IT APPROACHES SERN PA AND THE CHESAPEAKE BAY.
   HOWEVER...AREAS E OF WW 631 WILL CONTINUE TO BE MONITORED FOR AN
   INCREASE IN SVR WEATHER POTENTIAL.
   
   ..GARNER.. 07/11/2011
   
   
   ATTN...WFO...PHI...AKQ...CTP...LWX...
   
   LAT...LON   39887879 40417829 40517720 40287614 39487562 38257624
               38057782 38437930 39887879