MESOSCALE DISCUSSION 0889
   NWS STORM PREDICTION CENTER NORMAN OK
   1120 AM CDT FRI MAY 29 2009
   
   AREAS AFFECTED...SERN PA...SRN NJ...MD...DE...NRN VA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 291620Z - 291715Z
   
   ...SEVERE THREAT IS INCREASING ACROSS THE DELMARVA... 
   
   STRONG BOUNDARY LAYER HEATING CONTINUES EAST OF THE APPALACHIANS
   EARLY THIS AFTERNOON WHERE SFC-3KM LAPSE RATES ARE NOW APPROACHING
   7.5 C/KM ACROSS VA INTO SRN MD.  SFC PARCELS HAVE APPARENTLY REACHED
   THEIR CONVECTIVE TEMPERATURES WITH THUNDERSTORMS NOW DEVELOPING
   ALONG WIND SHIFT WITH RELATIVE EASE FROM SCNTRL PA INTO NRN VA. 
   THIS TREND SHOULD CONTINUE WITH A MARKED INCREASE IN CONVECTION
   EXPECTED ACROSS THE DELMARVA OVER THE NEXT FEW HOURS.  WITH MODEST
   SWLY FLOW THROUGH MID LEVELS...ESEWD MOVING STORMS WILL GRADUALLY
   ORGANIZE AS THEY SPREAD TOWARD THE NJ/DE/MD/VA COAST.  LARGE HAIL
   AND GUSTY WINDS ARE POSSIBLE.
   
   ..DARROW.. 05/29/2009
   
   
   ATTN...WFO...PHI...AKQ...CTP...LWX...
   
   LAT...LON   38997885 40247787 40547557 39537456 37887632 37897856
               38997885