MESOSCALE DISCUSSION 0586
   NWS STORM PREDICTION CENTER NORMAN OK
   0629 PM CDT FRI APR 25 2003
   
   AREAS AFFECTED...WRN /WCNTRL KY
   
   CONCERNING...TORNADO WATCH 169...
   
   VALID 252329Z - 260100Z
   
   STORMS CONTINUE TO WEAKEN IN INTENSITY IN MOST OF WW #169. WW WILL
   LIKELY BE CANCELLED IN ADVANCE OF THE SCHEDULED EXPIRATION TIME OF
   26/0200Z. 
   
   RECENT VISIBLE/IR IMAGERY INDICATES MULTIPLE CELL DEVELOPMENT
   CONTINUES TO EVOLVE IN SRN IL/WRN KY/AND EXTREME NWRN TN.
   HOWEVER...WARMING CLOUD TOPS AND SHORT TOPPED CONVECTION IN THESE
   AREAS REVEAL THAT STORMS ARE STRUGGLING DESPITE COOL 500MB
   TEMPERATURES AROUND -18C. WITH MARGINAL INSTABILITY IN THE REGION /
   50MB MIXED CAPES LESS THAN 500 J/KG / ...DEWPOINT VALUES ONLY FROM
   THE MID 50S INTO THE LOWER 60S...AND WITH THE LOSS OF SURFACE
   HEATING...EXPECT THE SEVERE THREAT TO CONTINUE TO DIMINISH OVER THE
   NEXT HOUR OR SO.  
   
   AN ISOLATED TORNADO THREAT CONTINUES WITH STORMS NEAR UPPER
   LOW...WHICH IS LOCATED NEAR PAH. IN THE ERN/SERN PORTION OF THE
   WW...GIVEN WET BULB ZERO LEVELS AROUND 7 KFT...VIA 18Z FCST
   SOUNDINGS AND OBJECTIVE ANALYSIS READINGS...AN ISOLATED HAIL THREAT
   WILL CONTINUE THE BE THE PRIMARY SEVERE THREAT FOR THE NEXT SEVERAL
   HOURS.	
   
   ..NADEN.. 04/25/2003
   
   
   ATTN...WFO...LMK...PAH...
   
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