MESOSCALE DISCUSSION 1950
   NWS STORM PREDICTION CENTER NORMAN OK
   0630 PM CDT FRI AUG 21 2009
   
   AREAS AFFECTED...NRN VA...MD...DE
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 728...
   
   VALID 212330Z - 220030Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 728
   CONTINUES.
   
   A SEVERE THREAT WILL LIKELY CONTINUE ACROSS MD THIS EVENING AND MAY
   MOVE INTO PARTS OF NRN DE. HAIL AND DAMAGING WINDS WILL BE POSSIBLE.
   THE SEVERE THREAT SHOULD REMAIN TOO ISOLATED TO WARRANT A WW.
   
   ISOLATED SEVERE STORMS ARE ONGOING IN NRN MD ALONG THE WRN SIDE OF
   AN AXIS OF MODERATE INSTABILITY WHERE MLCAPE VALUES ARE AROUND 2000
   J/KG ACCORDING TO THE RUC. THIS CONVECTION SHOULD CONTINUE EWD
   ACROSS THE REMAINDER OF MD WHERE A VERY MOIST AIRMASS EXISTS WITH
   SFC DEWPOINTS IN THE LOWER 70S F. THIS ALONG WITH ABOUT 50 KT OF
   MID-LEVEL FLOW EVIDENT ON REGIONAL WSR88D-VWPS SHOULD SUPPORT
   ROTATING STORMS. AN ISOLATED TORNADO THREAT WILL BE POSSIBLE WHICH
   IS BEING ENHANCED BY LOCALLY BACKED SFC-WINDS IN THE MID-ATLANTIC.
   HOWEVER...THE GREATEST THREATS SHOULD BE WIND DAMAGE AND HAIL. THE
   THREATS ARE EXPECTED TO REMAIN ISOLATED.
   
   ..BROYLES.. 08/21/2009
   
   
   ATTN...WFO...PHI...AKQ...LWX...
   
   LAT...LON   38167616 38307747 38367804 38787845 39327814 39467747
               39577663 39817546 39497486 38807491 38277540 38167616