MESOSCALE DISCUSSION 1703
   NWS STORM PREDICTION CENTER NORMAN OK
   0623 PM CDT THU AUG 09 2007
   
   AREAS AFFECTED...CNTRL/SRN OH...SW PA...NRN W VA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 575...
   
   VALID 092323Z - 100030Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 575
   CONTINUES.
   
   AN ADDITIONAL WW IS NOT ANTICIPATED.
   
   A SIGNIFICANT DECREASE IN CONVECTIVE INTENSITY HAS BECOME EVIDENT IN
   LIGHTNING DATA...WITHIN BULK OF ONGOING CONVECTION ALONG FRONTAL
   ZONE EXTENDING FROM THE UPPER OHIO VALLEY INTO MID ATLANTIC COASTAL
   AREAS.  THE ENVIRONMENT ACROSS MUCH OF NORTHEAST OHIO/WESTERN AND
   SOUTHERN PENNSYLVANIA INTO MARYLAND/NORTHERN VIRGINIA AND THE
   DELMARVA HAS BEEN STABILIZED BY PRIOR CONVECTIVE ACTIVITY. 
   STRONG/ISOLATED SEVERE STORMS COULD PERSIST ALONG MERGING OUTFLOWS
   TO THE SOUTH AND WEST OF FRONTAL ZONE...ACROSS PARTS OF
   CENTRAL/SOUTHERN OHIO INTO NORTH CENTRAL WEST VIRGINIA.  BUT...THE
   BOUNDARY LAYER TO THE SOUTH OF THE OUTFLOW IS ALREADY COOLING OFF OF
   DAYTIME HIGHS.  AND...AS INHIBITION STRENGTHENS FOR BOUNDARY LAYER
   BASED PARCELS WITH FURTHER COOLING NEXT FEW HOURS...THE INTENSITY OF
   STORMS IS EXPECTED TO DIMINISH THROUGH 01-02Z.  UNTIL THIS
   OCCURS...A FEW STORMS MAY CONTINUE TO PRODUCE GUSTY WINDS/SOME HAIL.
   
   ..KERR.. 08/09/2007
   
   
   ATTN...WFO...PHI...BGM...AKQ...CTP...LWX...PBZ...RLX...CLE...ILN...IWX...IND...
   
   38247546 38037765 38187898 38698092 38738307 39018450
   39788493 40798469 41468236 41748058 41957907 41557662
   40017446