MESOSCALE DISCUSSION 1684
   NWS STORM PREDICTION CENTER NORMAN OK
   0529 PM CDT MON JUL 07 2003
   
   AREAS AFFECTED...ERN PA / MD / DE / NJ / SRN NY / ERN VA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 667...
   
   VALID 072229Z - 072330Z
   
   TWO AREAS OF TSTM ACTIVITY CONTINUE IN THE ERN PARTS OF WW 667.
   WATCH WILL LIKELY BE ALLOWED TO EXPIRE AT SCHEDULED TIME OF 08/00Z. 
   
   
   SATELLITE IMAGERY INDICATES REMNANT MCV FEATURE NOW INTO THE ERN
   PA/SERN NY REGION.  STORMS ARE BEGINNING TO INTENSIFY VIA CELL
   MERGERS IN PARTS OF SERN NY STATE AMIDST A MODERATELY UNSTABLE RAIN
   WRAPPED BOUNDARY LAYER. EXPECT THIS ACTIVITY TO CONTINUE TO MOVE
   SLOWLY EWD INTO PARTS OF SWRN/SRN MA AND PARTS OF WRN CT OVER THE
   NEXT HOUR OR SO.  PRIMARY THREATS ARE AREAS OF VERY HEAVY RAINFALL
   AND SOME DAMAGING WINDS...ALTHOUGH AIR MASS OVER THESE AREAS SHOWS
   SIGNS OF BECOMING MORE STABLE. 
   
   FURTHER SOUTH...IN PORTIONS OF MD/DE SWD INTO AREAS OUTSIDE OF WW
   667 INTO NRN/NERN VA...ACTIVITY IS EXPECTED TO CONTINUE TO YIELD
   SOME DAMAGING WIND GUSTS OVER THE NEXT FEW HOURS BEFORE ACTIVITY
   HEADS OFFSHORE. THE ATMOSPHERE IN THESE AREAS IS MODERATELY/VERY
   UNSTABLE -- TEMPERATURES INTO THE UPPER 80S/LOW 90S WITH DEWPOINT
   VALUES MAINLY IN THE LOWER 70S. ACTIVITY LIKELY WILL CONTINUE TO
   EXHIBIT A TENDENCY TO BACKBUILD SWWD INTO ELEVATED PARTS OF WRN/NWRN
   VA WHERE STRONGER BOUNDARY LAYER MOISTURE CONVERGENCE EXISTS VIA
   OBJECTIVE ANALYSIS FIELDS AS WLY FLOW MERGES WITH SSWLY FLOW JUST
   EAST/ALONG THE APPALACHIAN CHAIN. PRIMARY SEVERE THREATS  IN THESE
   AREAS WILL BE DAMAGING DOWNBURST WINDS AND AREAS OF VERY HEAVY
   RAINFALL.
   
   ..NADEN.. 07/07/2003
   
   
   ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX...RNK...
   
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