MESOSCALE DISCUSSION 0502
   NWS STORM PREDICTION CENTER NORMAN OK
   0136 AM CDT SAT MAY 08 2010
   
   AREAS AFFECTED...CENTRAL AND SWRN PA/SERN OH/NRN WV PANHANDLE SWD
   INTO WV/ERN KY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 145...
   
   VALID 080636Z - 080730Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 145
   CONTINUES.
   
   WW 145 WILL BE ALLOWED TO EXPIRE AT 07Z.
   
   OBJECTIVE ANALYSES INDICATED INSTABILITY HAS CONTINUED TO WANE
   ACROSS CENTRAL-SWRN PA SWWD INTO WV/ERN KY AHEAD OF A COLD FRONT
   ADVANCING EWD INTO THESE STATES OVERNIGHT.  BY 12Z...THE COLD FRONT
   IS EXPECTED TO EXTEND FROM CENTRAL NY SWD THROUGH CENTRAL-ERN PA...
   AND THEN SWWD THROUGH WRN VA TO NRN GA.
   
   DESPITE STRONG HEIGHT FALLS /90-150 METERS AT H5/ FROM LOWER GREAT
   LAKES TO UPPER TN VALLEY THAT WOULD SUPPORT CONVECTIVE
   DEVELOPMENT...VEERING LOW LEVEL WINDS WILL TEND TO REDUCE LOW LEVEL
   CONVERGENCE ALONG THE COLD FRONT.  THIS COMBINED WITH WEAK
   INSTABILITY IS EXPECTED TO FURTHER LIMIT THE OVERALL POTENTIAL FOR
   SUSTAINED UPDRAFTS AND ATTENDANT SEVERE WEATHER THREAT WITHIN WW 145
   AND FURTHER S INTO ERN KY/WV.  HOWEVER...GIVEN THE STRENGTH OF THE
   WIND FIELDS ACCOMPANYING THE STRONG DEEPENING MID-UPPER LEVEL TROUGH
   MOVING EWD INTO THE GREAT LAKES/OH VALLEY...LOCALLY STRONG WIND
   GUSTS WILL BE POSSIBLE WITH CONVECTION ALONG THE COLD FRONT. 
   WSR-88D VWPS FROM SRN NY TO ERN TN INDICATED 40-50 KT WIND SPEEDS
   DOWN TO 0.5 KM AGL.  IN ADDITION...25 DEGREE SURFACE
   TEMPERATURE-DEWPOINT SPREADS ACROSS WV MAY ENHANCE WIND GUST
   POTENTIAL THROUGH EVAPORATIVE COOLING PROCESSES.
   
   ..PETERS.. 05/08/2010
   
   
   ATTN...WFO...BGM...BUF...CTP...RNK...PBZ...RLX...MRX...JKL...
   
   LAT...LON   42017803 41947646 41027709 39617913 37998099 36928248
               36998350 37768312 38658207 40268019 40837890 42017803