MESOSCALE DISCUSSION 0486
   NWS STORM PREDICTION CENTER NORMAN OK
   0802 PM CDT TUE APR 16 2013
   
   AREAS AFFECTED...SERN IL/SRN INDIANA/SRN OH/SWRN PA/WV/NRN KY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 111...112...
   
   VALID 170102Z - 170230Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   111...112...CONTINUES.
   
   SUMMARY...LIMITED SEVERE THREAT -- MAINLY IN THE FORM OF HAIL --
   CONTINUES ACROSS VALID PORTIONS OF WW 111 AND 112.  A GENERAL
   DOWNWARD TREND IN CONVECTIVE INTENSITY -- AND THUS SEVERE THREAT --
   IS EXPECTED OVER THE NEXT FEW HOURS.
   
   DISCUSSION...RADAR LOOP SHOWS THUNDERSTORMS ONGOING FROM PA WSWWD
   ALONG THE OH VALLEY TO SERN IL/WRN KY...WITH STORMS ORGANIZED
   LOOSELY INTO A BAND FROM SWRN PA SWWD ACROSS SRN OH/WRN WV/NRN KY
   AND THEN MORE CELLULAR ACTIVITY ACROSS NWRN KY/SRN INDIANA/SERN IL. 
   STORMS GENERALLY REMAIN SUB-SEVERE ACROSS THIS AREA...WITH
   OCCASIONAL UPDRAFT ENHANCEMENT IN STRONGER CELLS RESULTING IN
   CONTINUED POTENTIAL FOR ISOLATED HAIL.
   
   OVER THE NEXT FEW HOURS...EXPECT CELLS TO SHOW A GENERAL DIMINISHING
   TREND -- PARTICULARLY ACROSS THE MID AND UPPER OH
   VALLEY/APPALACHIANS REGION WHERE INSTABILITY IS WEAKER AND DIURNAL
   COOLING/STABILIZATION INCREASES.  ISOLATED THREAT MAY LINGER LONGEST
   ACROSS THE SRN IN/NWRN AND N CENTRAL KY AREA...WHERE GREATER
   INSTABILITY AND MORE FAVORABLE STORM MODE IS OBSERVED.
   
   ..GOSS.. 04/17/2013
   
   
   ATTN...WFO...CTP...PBZ...RLX...JKL...ILN...LMK...IND...PAH...
   ILX...
   
   LAT...LON   38828332 39188177 40308026 40467926 39837937 38608007
               37788176 37898447 37308638 37358836 38068887 39138645
               39468503 38828332