MESOSCALE DISCUSSION 0901
   NWS STORM PREDICTION CENTER NORMAN OK
   0503 PM CDT TUE MAY 25 2004
   
   AREAS AFFECTED...CENTRAL/SERN MO SRN IL SWRN IN WRN KY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 288...
   
   VALID 252203Z - 252330Z
   
   MCS COMPOSED OF DISCRETE SUPERCELLS AND EVOLVING BOW ECHOES
   CONTINUES TO TAKE SHAPE OVER SERN MO/SRN IL.  SUPERCELLS WITH LOW
   LEVEL ROTATION HAVE PERSISTED ALONG LEADING COLD FRONT NOW MOVING
   INTO E-CENTRAL MO AND SRN IL...WHERE SURFACE PRESSURE FALL MAXIMUM
   IS NOW LOCATED.  LOCAL BACKING OF LOW LEVEL WINDS NEAR THIS LOW
   CENTER WILL MAINTAIN AN ISOLATED TORNADO THREAT FOR ANOTHER HOUR OR
   SO.  HOWEVER...OVERALL UNIDIRECTIONAL WIND PROFILE PARALLEL TO E-W
   ORIENTED SURFACE BOUNDARY EXTENDING ALONG THE OH RIVER VALLEY FAVORS
   EVOLUTION INTO ONE OR MORE BOW ECHO SYSTEMS INTO THE EARLY EVENING. 
   ACTIVITY SHOULD SHIFT ESEWD AND FEED OF A VERY UNSTABLE AIR MASS
   SOUTH OF E-W FRONT.
   
   FARTHER WEST ALONG AND NORTH OF COLD FRONT INTO CENTRAL MO...SEVERE
   THUNDERSTORM THREAT APPEARS TO BE DIMINISHING AS LARGE SCALE ASCENT
   AND MAIN FOCUS THUNDERSTORM DEVELOPMENT SHIFTS EAST OF THE MS RIVER
   ALONG SWLY H85 JET.  HOWEVER...THUNDERSTORMS MAY POSE A THREAT LARGE
   HAIL FOR ANOTHER HOUR OR SO AS THEY FEED OFF OF 1000-1500 J/KG
   MUCAPE.
   
   ..EVANS.. 05/25/2004
   
   
   ATTN...WFO...LMK...IND...PAH...ILX...LSX...LZK...SGF...
   
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