MESOSCALE DISCUSSION 1008
   NWS STORM PREDICTION CENTER NORMAN OK
   0303 PM CDT TUE JUN 09 2009
   
   AREAS AFFECTED...EXTREME SRN-SERN OH...NRN WV...MUCH OF MD...AND NRN
   VA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 356...
   
   VALID 092003Z - 092100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 356
   CONTINUES.
   
   CONVECTIVE EVOLUTION WITHIN WW 356 OVER NRN VA AND MD HAS TRENDED
   TOWARD LINEAR...COMPOSED OF LINE SEGMENTS AND SMALL BOWING ELEMENTS.
   FARTHER W OVER EXTREME SRN-SERN OH AND WV...DISCRETE MULTICELLS HAVE
   BEEN OBSERVED MOVING ESE AT 30 KT. ALL OF THIS ACTIVITY CONTINUES TO
   OCCUR AHEAD OF A SURFACE COLD FRONT WHICH AT 20Z WAS LOCATED FROM
   ROUGHLY S-CENTRAL NY SW INTO SRN OH. THESE STORMS ARE PROPAGATING
   INTO A WARM...MOIST...AND MODERATELY TO STRONGLY UNSTABLE
   ATMOSPHERE...WITH AN AXIS OF MLCAPE VALUES NEAR 2500 J/KG LOCATED
   FROM SRN PA SW ACROSS WV AND INTO ERN KY. 
   
   THE LINEAR EVOLUTION OVER ERN PORTIONS OF WW 356 /NRN VA AND MD/
   SUGGESTS AN INCREASING RISK FOR DAMAGING STRAIGHT LINE WINDS MAY BE
   DEVELOPING...WHILE FARTHER W /OH AND WV/...LARGE HAIL AND DAMAGING
   DOWNBURST WINDS WILL REMAIN POSSIBLE WITH THE STRONGER UPDRAFT
   CORES.
   
   ..GARNER.. 06/09/2009
   
   
   ATTN...WFO...PHI...AKQ...LWX...RNK...PBZ...RLX...JKL...ILN...
   
   LAT...LON   39398249 39647633 38177634 37948251 39398249