MESOSCALE DISCUSSION 1131
   NWS STORM PREDICTION CENTER NORMAN OK
   0213 PM CDT WED JUN 13 2007
   
   AREAS AFFECTED...ERN OH/PA/MD/NRN VA/NRN AND ERN WV
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 392...
   
   VALID 131913Z - 132045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 392
   CONTINUES.
   
   PARAMETERS REMAIN FAVORABLE FOR HAIL AND DAMAGING WIND GUSTS WITH
   THE TSTMS ACROSS WW 392.
   
   REGIONAL RADARS/SATELLITE IMAGERY AND LIGHTNING DATA INDICATED
   CLUSTERS OF TSTMS EXTENDING FROM NWRN INTO CENTRAL AND ERN PA...
   WITH ADDITIONAL STORMS HAVING FORMED ALONG THE HIGHER TERRAIN FROM
   CENTRAL PA SWWD TO ERN/SRN WV.  STORMS ALSO CONTINUE TO DEVELOP IN
   MD IN THE VICINITY OF BALTIMORE AND THE DISTRICT OF COLUMBIA.  MUCH
   OF THE ACTIVITY EXTENDING FROM NWRN-ERN PA APPEARS TO BE AIDED BY
   COOLER MID LEVEL TEMPERATURES AND ASCENT AHEAD OF A SHORT WAVE
   TROUGH MOVING SSWWD ACROSS PA THIS AFTERNOON.  ALTHOUGH DEEP LAYER
   SHEAR IS MODEST AT BEST...25-30 KT OF NELY MID LEVEL WINDS WILL
   REMAIN SUFFICIENT FOR MULTICELLS GIVEN A MODERATELY UNSTABLE AIR
   MASS.  
   
   THE ENVIRONMENT W OF WW 392 INTO CENTRAL/SRN OH HAS ALSO BECOME
   MODERATELY UNSTABLE WITH LARGER SURFACE DEWPOINT DEPRESSIONS. 
   THUS...STRONG TO SEVERE STORMS NOW LOCATED IN NERN OH MAY POSE A
   DAMAGING WIND THREAT INTO ERN OH...WITH LOCAL WFO EXTENSION OF THIS
   WW POSSIBLE.
   
   ..PETERS.. 06/13/2007
   
   
   ATTN...WFO...PHI...BGM...AKQ...CTP...LWX...RNK...PBZ...RLX...CLE...
   
   41978041 41997889 41987702 41337577 41117567 40827551
   39977582 37847592 37877656 38257803 38247955 37908017
   38278095 38748161 39878178 41168167