MESOSCALE DISCUSSION 0818
   NWS STORM PREDICTION CENTER NORMAN OK
   1103 AM CDT SAT MAY 22 2004
   
   AREAS AFFECTED...NRN/CNTRL IL...NWRN IND
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 221603Z - 221700Z
   
   ...SEVERE THUNDERSTORMS SHOULD DEVELOP ACROSS PORTIONS OF IL AND IND
   BY EARLY AFTERNOON.  WW WILL LIKELY BE ISSUED SHORTLY..
   
   REMNANTS OF EARLY MORNING MCS ARE PROGRESSING EWD AT ROUGHLY 30-35KT
   INTO WRN IL.  THIS ACTIVITY DID NOT DISSIPATE COMPLETELY...AND AS OF
   THE LAST HOUR THE LEADING EDGE APPEARS TO BE INCREASING IN
   INTENSITY.  STRONG BOUNDARY LAYER HEATING ACROSS IL INTO IND IS
   STEEPENING LAPSE RATES BENEATH SUFFICIENT DEEP LAYER SHEAR FOR
   SEVERE MULTI-CELL CLUSTERS...OR PERHAPS ISOLATED SUPERCELLS IF
   CONVECTION CAN DEVELOP AHEAD OF REJUVENATING MCS.
   
   ..DARROW.. 05/22/2004
   
   
   ATTN...WFO...IWX...IND...LOT...ILX...DVN...
   
   39989040 41538917 41688591 40718619 40278780