MESOSCALE DISCUSSION 0728
   NWS STORM PREDICTION CENTER NORMAN OK
   1221 PM CDT FRI APR 25 2008
   
   AREAS AFFECTED...NERN MO...ERN IA...WRN IL
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 251721Z - 251815Z
   
   CONVECTION IS BEGINNING TO INTENSIFY ALONG ADVANCING COLD FRONT FROM
   THE MO/IA BORDER...SWD TO NEAR I-70 IN CNTRL MO PER RAPID INCREASE
   IN LIGHTNING AND REFLECTIVITY.  THIS ACTIVITY SHOULD CONTINUE TO
   EXPAND IN AREAL COVERAGE AS COLD FRONT SURGES EWD INTO ERN IA AND
   WRN IL.  LATEST DIAGNOSTIC DATA SUGGESTS BOUNDARY LAYER AIRMASS HAS
   DESTABILIZED SIGNIFICANTLY OVER THE LAST FEW HOURS WITH SBCAPE
   VALUES NOW ON THE ORDER OF 1500 J/KG.  VERTICAL SHEAR PROFILES ARE
   MORE THAN ADEQUATE TO SUSTAIN DISCRETE SUPERCELL
   STRUCTURES...ALTHOUGH STRONG FORCING MAY ULTIMATELY RESULT IN A
   SQUALL LINE WITH EMBEDDED SUPERCELLS.  EVEN SO...IT APPEARS SEVERE
   THREAT...INCLUDING ISOLATED TORNADOES...IS INCREASING ACROSS THE MID
   MS VALLEY.  WW WILL LIKELY BE ISSUED WITHIN THE HOUR.
   
   ..DARROW.. 04/25/2008
   
   
   ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...
   
   38709301 40689277 42639153 42058933 38789091