MESOSCALE DISCUSSION 0563
   NWS STORM PREDICTION CENTER NORMAN OK
   1158 PM CDT SUN APR 24 2011
   
   AREAS AFFECTED...ERN PORTIONS TX/OK PANHANDLES...WRN/NRN
   OK...EXTREME S-CENTRAL KS.
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 250458Z - 250630Z
   
   POTENTIAL MAY INCREASE THROUGH 09Z FOR SVR TSTMS WITH LARGE
   HAIL...MOVING ENEWD WHILE THREAT SPREADS EWD ACROSS THIS AREA.
   
   EXPECT MID-UPPER TROUGH...APCHG FROM SWRN CONUS...TO YIELD
   SIMULTANEOUS STRENGTHENING OF DEEP-LAYER SHEAR...ELEVATED/LOW-LEVEL
   WAA/MOISTURE TRANSPORT ABOVE COOL/STABLE BOUNDARY LAYER...AND
   MID-UPPER LEVEL ASCENT/COOLING OVER THIS AREA.  NET RESULT WILL BE
   FAVORABLE DEEP-LAYER ASCENT/DESTABILIZATION FOR ELEVATED TSTMS TO
   DEVELOP...IN ENVIRONMENT CHARACTERIZED BY 45-55 KT EFFECTIVE
   SHEAR...FAVORABLE STORM-RELATIVE WINDS IN ELEVATED INFLOW
   LAYER...AND INCREASING BUOYANCY.  MUCAPE WILL INCREASE WITH EWD
   EXTENT AND WITH TIME ACROSS DISCUSSION AREA...REACHING UP TO 2000
   J/KG NEAR I-40 IN CENTRAL OK THROUGH 09Z.  IR IMAGERY INDICATES
   COOLING LOW-MIDLEVEL CLOUDS OVER THIS REGION...EVIDENCE OF
   AFOREMENTIONED ASCENT SPREADING EWD OVER REGION AND PROBABLE
   PRECURSOR TO ADDITIONAL DEEP-CONVECTIVE FORMATION DURING NEXT FEW
   HOURS.  WHILE FOCI IN ELEVATED-INITIATION SITUATIONS TYPICALLY ARE
   RATHER NEBULOUS...CONVECTION MAY BECOME MOST CONCENTRATED INVOF
   850-MB WARM FRONT OVER NWRN/N-CENTRAL OK...IN LAYER PROGGED TO
   EXPERIENCE GREATEST ASCENT THROUGH REMAINDER OVERNIGHT HOURS.
   
   ..EDWARDS.. 04/25/2011
   
   
   ATTN...WFO...TSA...ICT...OUN...DDC...AMA...
   
   LAT...LON   36590085 36980009 37129879 37159769 36929695 36509683
               35759688 35399776 35469887 35720042 35970093 36590085