MESOSCALE DISCUSSION 1574
   NWS STORM PREDICTION CENTER NORMAN OK
   0354 PM CDT THU JUN 26 2008
   
   AREAS AFFECTED...EXTREME SRN NEB...N CENTRAL AND NE KS
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 262054Z - 262230Z
   
   ISOLATED SEVERE STORMS WILL BE POSSIBLE THIS AFTERNOON ALONG THE
   STALLED OUTFLOW BOUNDARY NEAR THE KS/NEB BORDER.  A SEVERE TSTM
   WATCH MAY BE NEEDED IN THE NEXT 1-2 HOURS.
   
   VISIBLE IMAGERY AND SURFACE OBSERVATIONS CONFIRM THAT THE LOW LEVELS
   ARE DESTABILIZING ACROSS NE KS...ALONG AND S OF AN OUTFLOW BOUNDARY
   FROM ONGOING CONVECTION IN SE NEB AND NW MO.  MLCAPE VALUES HAVE
   INCREASED TO NEAR 3000 J/KG IN CONJUNCTION WITH STEEP MID LEVEL
   LAPSE RATES AND THE MOIST/WARMING BOUNDARY LAYER.  VERTICAL SHEAR IS
   MARGINALLY FAVORABLE FOR ORGANIZED SEVERE STORMS ALONG THE BOUNDARY
   WHERE LOW-LEVEL FLOW IS BACKED...AND THIS FACTOR COULD LOCALLY
   ENHANCE THE LARGE HAIL THREAT THIS AFTERNOON.  OTHERWISE...STORMS
   WILL BE CAPABLE OF PRODUCING ISOLATED DAMAGING WINDS...ESPECIALLY IF
   STORM MERGERS LEAD TO UPSCALE GROWTH INTO A SMALL CLUSTER THIS
   EVENING.
   
   ..THOMPSON.. 06/26/2008
   
   
   ATTN...WFO...EAX...OAX...TOP...GID...
   
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