ZCZC SPCSWOMCD ALL
ACUS11 KWNS 092001 
SPC MCD 092001 
WVZ000-OHZ000-KYZ000-INZ000-092100-

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

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

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

LAT...LON   39168528 40118071 38578027 37608484 39168528 

NNNN