MESOSCALE DISCUSSION 0866
   NWS STORM PREDICTION CENTER NORMAN OK
   0547 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...CNTRL THROUGH ERN WI...ERN IA...NRN IL
   
   CONCERNING...TORNADO WATCH 322...323...327...
   
   VALID 222247Z - 230015Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH
   322...323...327...CONTINUES.
   
   THREAT FOR TORNADOES...LARGE HAIL AND DAMAGING WIND WILL PERSIST
   NEXT FEW HOURS WITH STORMS DEVELOPING FROM ERN IA THROUGH WI AND NRN
   IL.
   
   EARLY THIS EVENING NUMEROUS STORMS CONTINUE ALONG AND AHEAD OF COLD
   FRONT THAT EXTENDS FROM A SURFACE LOW IN SRN MN SWD THROUGH ERN IA
   AND NRN MO. FUTURE STORM EVOLUTION WILL LIKELY BE INFLUENCED BY A
   WWD MOVING OUTFLOW BOUNDARY THAT HAS ORIGINATED FROM STORMS MOVING
   THROUGH ERN IL INTO NWRN IND. NEW STORMS HAVE DEVELOPED ALONG THIS
   BOUNDARY AS IT MOVES WWD THROUGH NWRN IL. THE BOUNDARY LAYER ACROSS
   THE REMAINDER OF NRN IL INTO SERN WI HAS BEEN RENDERED LESS UNSTABLE
   BY THE EFFECTS OF THIS CONVECTIVE OUTFLOW. A TEMPORARY INCREASE MAY
   OCCUR AS PRE-EXISTING STORMS MERGE WITH THE WWD SURGING OUTFLOW.
   THEREAFTER...IT IS UNCLEAR HOW MUCH OF A NEGATIVE IMPACT THE MORE
   STABLE BOUNDARY LAYER WILL HAVE ON THE STORMS AS THEY CONTINUE EWD.
   NEVERTHELESS...GIVEN LARGE HODOGRAPHS IN ASSOCIATION WITH 40-50 KT
   SWLY LLJ AND SHEAR PROFILES SUPPORTIVE OF SUPERCELLS AND BOWING
   SEGMENTS...SOME THREAT FOR ISOLATED TORNADOES AND LARGE HAIL WILL
   LIKELY PERSIST NEXT FEW HOURS.
   
   ..DIAL.. 05/22/2011
   
   
   ATTN...WFO...GRB...LOT...ILX...MKX...DVN...ARX...
   
   LAT...LON   42408787 40828823 40399093 41449179 43819051 45178960
               44938779 42408787