MESOSCALE DISCUSSION 0887
   NWS STORM PREDICTION CENTER NORMAN OK
   0933 AM CDT MON MAY 23 2011
   
   AREAS AFFECTED...WRN AND CNTRL PA...ERN WV...NRN VA...WRN MD
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 231433Z - 231600Z
   
   A WIND DAMAGE THREAT IS EXPECTED TO DEVELOP LATE THIS MORNING INTO
   EARLY THIS AFTERNOON AS THE LEADING EDGE OF A LINE OF THUNDERSTORMS
   INTENSIFIES. A WW WILL LIKELY BECOME NECESSARY ACROSS THE REGION
   OVER THE HOUR.
   
   A LINE OF THUNDERSTORMS FROM NEAR THE PA-OH STATE-LINE SWD INTO
   CNTRL WV IS LOCATED JUST AHEAD OF A SHORTWAVE TROUGH EVIDENT ON
   WATER VAPOR IMAGERY. AHEAD OF THE LINE...MESOANALYSIS SUGGESTS
   INSTABILITY IS INCREASING ACROSS CNTRL PA SWD INTO NRN VA WHERE
   SBCAPE VALUES NOW RANGE FROM 500 TO 1000 J/KG. IN
   ADDITION...MESOANALYSIS SHOWS A WELL-DEFINED 700 MB JET ACROSS THE
   CNTRL APPALACHIAN MTNS. AS THIS FEATURE APPROACHES THE REGION FROM
   THE SOUTHWEST...DEEP LAYER SHEAR WILL LIKELY INCREASE HELPING TO
   ORGANIZE A WIND DAMAGE THREAT AS STORMS INCREASE IN INTENSITY LATE
   THIS MORNING. THE WIND DAMAGE THREAT SHOULD PERSIST INTO THE EARLY
   AFTERNOON AS THE STORMS MOVE ACROSS WRN MD AND CNTRL PA.
   
   ..BROYLES.. 05/23/2011
   
   
   ATTN...WFO...AKQ...BUF...CTP...LWX...RNK...PBZ...RLX...
   
   LAT...LON   42157809 42137893 41807925 41147950 40307971 38778001
               38027969 37887849 38217726 39257652 41687729 42157809