MESOSCALE DISCUSSION 0904
   NWS STORM PREDICTION CENTER NORMAN OK
   1037 PM CDT SAT MAY 30 2009
   
   AREAS AFFECTED...SRN IND...KY...SRN OH...WV AND FAR SWRN VA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 316...317...
   
   VALID 310337Z - 310400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   316...317...CONTINUES.
   
   PARTS OF WW 316 MAY BE LOCALLY EXTENDED BY WFO/S BEYOND 04Z
   EXPIRATION.  WW 317 MAY BE CANCELLED EARLY /PRIOR TO 06Z/ AS MUCH OF
   THE TSTM ACTIVITY HAS EXITED THIS WATCH.
   
   RECENT TRENDS IN OBJECTIVE ANALYSES INDICATED STRENGTHENING SURFACE
   INHIBITION ACROSS THE OH VALLEY...WITH STRONGEST STORMS...THOUGH
   GENERALLY ISOLATED...LOCATED FROM SRN IND INTO WRN KY.  THIS LATTER
   ACTIVITY IS LOCATED CLOSER TO THE GREATER SOURCE OF AVAILABLE
   INSTABILITY OVER THE LOWER OH VALLEY...WITH THESE STORMS BEING FED
   BY A 30-40 KT WLY LLJ.  THIS LLJ WILL TRANSLATE ESEWD TOWARD THE
   CENTRAL APPALACHIANS OVERNIGHT AS ATTENDANT MID LEVEL IMPULSE/SPEED
   MAX SPREADS ACROSS THE OH VALLEY.  WEAK LOW LEVEL WAA ACROSS KY
   BENEATH UPPER LEVEL DIFFLUENT FLOW ALONG SRN EXTENT OF STRONGER FLOW
   REGIME ALOFT SHOULD MAINTAIN TSTM DEVELOPMENT OVERNIGHT. 
   AFOREMENTIONED ACTIVITY FROM SRN IND INTO CENTRAL/ERN KY SHOULD
   CONTINUE TO HAVE THE GREATEST POTENTIAL FOR A SEVERE THREAT FOR THE
   NEXT FEW HOURS AS IT REMAINS CLOSER TO INFLOW OF STRONGER
   INSTABILITY.
   
   ..PETERS.. 05/31/2009
   
   
   ATTN...WFO...RNK...RLX...MRX...JKL...ILN...LMK...IND...PAH...
   
   LAT...LON   37138578 37638779 39728617 39478491 39578322 39508170
               39158073 37848108 36908213 36828459 37138578