MESOSCALE DISCUSSION 1684
   NWS STORM PREDICTION CENTER NORMAN OK
   0721 PM CDT SUN JUL 26 2009
   
   AREAS AFFECTED...ERN VA...MD...DEL AND SRN NJ
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 625...
   
   VALID 270021Z - 270115Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 625
   CONTINUES.
   
   PRIMARY SEVERE THREAT ACROSS REMAINING PART OF WW 625 NEXT COUPLE
   HOURS WILL PERSIST OVER SE VA WITH ISOLATED LARGE HAIL...DAMAGING
   WIND AND VERY HEAVY RAIN THE MAIN THREATS. AT THIS TIME IT APPEARS
   THE OVERALL SEVERE POTENTIAL WILL BECOME INCREASINGLY ISOLATED AND
   WW 625 WILL BE ALLOWED TO EXPIRE AT 01Z.
   
   CONVECTION OVER SERN VA HAS CONSOLIDATED INTO A SW-NE LINE OF
   TRAINING STORMS FOLLOWING THE MERGER OF TWO OUTFLOW BOUNDARIES.
   THESE STORMS REMAIN IN A FAVORABLE LOCATION TO INGEST HIGHER THETA-E
   AIR NEXT HOUR OR TWO FROM A BOUNDARY LAYER THAT HAS NOT BEEN
   OVERTURNED. LATEST OBJECTIVE ANALYSIS SHOWS A SMALL RESERVOIR OF
   1500-2000 J/KG MLCAPE OVER SE VA.
   
   OTHERWISE...THE STRONGER STORMS FARTHER NORTH ARE SHIFTING INTO WW
   626 ACROSS SERN PA. SURFACE DATA SHOW A MUCH COOLER SURFACE LAYER
   FROM NERN VA INTO MD AND DEL IN WAKE OF EARLIER CONVECTION
   SUGGESTING ANY REMAINING SEVERE THREAT IN THIS AREA SHOULD REMAIN
   LIMITED.
   
   ..DIAL.. 07/27/2009
   
   
   ATTN...WFO...PHI...AKQ...
   
   LAT...LON   36627614 36617690 37047732 37317711 37847616 38937592
               39507603 39707563 39257495 38037489 37077569 36627614