MESOSCALE DISCUSSION 0878
   NWS STORM PREDICTION CENTER NORMAN OK
   0959 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...SWRN LOWER MI THROUGH NRN IND
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 332...
   
   VALID 230259Z - 230400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 332
   CONTINUES.
   
   PRIMARY SEVERE THREAT IN WW 332 WILL LIKELY BE WITH STORMS CROSSING
   LAKE MI. IF THESE STORMS WEAKEN AS THEY MOVE INLAND...THEN WW 332
   CAN PROBABLY BE CANCELLED EARLY.
   
   ATMOSPHERE REMAINS ONLY MARGINALLY UNSTABLE WITH TEMPERATURES ONLY
   IN THE LOW 60S WITH 50S DEWPOINTS ACROSS SWRN LOWER MI INTO NRN IND
   ALONG WITH MODEST EFFECTIVE SHEAR. THIS INCREASES THE UNCERTAINTY
   REGARDING POTENTIAL SEVERE THREAT WITH STORMS NOW CROSSING LAKE MI.
   STRONG STORM RELATIVE INFLOW ASSOCIATED WITH STRENGTHENING LLJ MAY
   HELP TO SUSTAIN A FORWARD PROPAGATING MCS INTO LOWER MI WITH THREAT
   FOR MAINLY DAMAGING WIND...BUT A MARGINAL THERMODYNAMIC ENVIRONMENT
   COULD LIMIT OVERALL SEVERE POTENTIAL.
   
   ..DIAL.. 05/23/2011
   
   
   ATTN...WFO...IWX...GRR...IND...
   
   LAT...LON   43088494 41628475 40648515 40488681 42038688 43128612
               43088494