MESOSCALE DISCUSSION 0250
   NWS STORM PREDICTION CENTER NORMAN OK
   0301 PM CDT THU APR 09 2015

   AREAS AFFECTED...NRN KY...SRN OH...NWRN WV

   CONCERNING...SEVERE THUNDERSTORM WATCH 40...

   VALID 092001Z - 092100Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 40
   CONTINUES.

   SUMMARY...SEVERE THREAT WILL SPREAD ACROSS SRN OH INTO NRN WV AND
   SWRN PA OVER THE NEXT FEW HOURS.  NEW SEVERE THUNDERSTORM WATCH MAY
   BE REQUIRED SHORTLY TO ACCOUNT FOR THIS THREAT.

   DISCUSSION...CLUSTER OF SEVERE THUNDERSTORMS THAT HAS MIGRATED NORTH
   OF THE OH RIVER APPEARS TO HAVE ENOUGH ORGANIZATION/MOMENTUM TO
   CONTINUE BEYOND WW40 ERN BORDER.  DEEP SWLY FLOW ACROSS THIS REGION
   IS MORE THAN ADEQUATE FOR ORGANIZED CONVECTION TO SPREAD INTO SWRN
   PA...ESPECIALLY GIVEN THE BOUNDARY LAYER RECOVERY OBSERVED ACROSS
   THIS REGION.  LATEST RADAR DATA SUGGESTS MCS IS EVOLVING OVER SRN OH
   AND CURRENT SPEEDS WOULD SUGGEST THIS ACTIVITY COULD SPREAD EAST OF
   THE WW BY 22Z.  FOR THIS REASON A NEW SEVERE THUNDERSTORM WATCH MAY
   BE REQUIRED.

   ..DARROW/GRAMS.. 04/09/2015


   ATTN...WFO...PBZ...RLX...JKL...ILN...LMK...

   LAT...LON   39168528 40118071 38578027 37608484 39168528