MESOSCALE DISCUSSION 1092
   NWS STORM PREDICTION CENTER NORMAN OK
   0755 PM CDT SAT JUN 04 2011
   
   AREAS AFFECTED...CENTRAL IL/CENTRAL AND SRN IND/WRN AND SWRN OH
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 426...427...428...
   
   VALID 050055Z - 050200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   426...427...428...CONTINUES.
   
   DAMAGING WINDS SHOULD BE THE PRIMARY THREAT THIS EVENING AS STORMS
   AFFECT CENTRAL/SERN IL...CENTRAL/SRN IND AND WRN/SWRN OH.
   
   A LOCAL SSEWD EXTENSION OF WW 427 AND A LOCAL SWD EXTENSION OF WW
   428 HAVE OCCURRED PER COORDINATION BETWEEN SPC AND WFO/S ILX/IND. 
   EACH EXTENSION IS BASED ON THE LIKELIHOOD FOR TWO FORWARD
   PROPAGATING MCS/S...1/ ONE LARGE CLUSTER OF STORMS IN CENTRAL IND
   AND 2/ A SMALLER CLUSTER IN CENTRAL IL TO PROGRESS SWD AND
   SEWD...RESPECTIVELY.  MEANWHILE...THE OVERALL SEVERE WEATHER THREAT
   ACROSS THE NRN IND/NWRN OH PORTIONS OF WW 426 WILL CONTINUE TO
   DIMINISH AS THE STRONGER ACTIVITY ADVANCES SWD.
   
   00Z SOUNDINGS FROM SWRN OH TO CENTRAL IL AND SWD THROUGH AT LEAST
   WRN KY INDICATED THE AIR MASS REMAINED VERY UNSTABLE /MLCAPE AROUND
   3000 J PER KG/.  ALTHOUGH MIDLEVEL FORCING/WINDS ARE WEAK ACROSS THE
   LOWER OH VALLEY...ESPECIALLY WITH WWD EXTENT INTO IL...COLD POOL
   DEVELOPMENT WITH EACH OF THE ABOVE MENTIONED MCS/S AND THE VERY
   UNSTABLE DOWNSTREAM AIR MASS ARE EXPECTED TO SUPPORT A CONTINUED
   THREAT FOR DAMAGING WINDS WITH EACH COMPLEX.  THIS FORECAST SCENARIO
   HAS RESULTED IN THE SEWD/SWD EXTENSIONS OF WW/S 427 AND 428.
   
   MEANWHILE...A CONVECTIVE OUTFLOW ENHANCED LAKE BREEZE CONTINUES TO
   MOVE SWWD INTO CENTRAL-EAST CENTRAL IL.  STORM DEVELOPMENT WILL
   REMAIN POSSIBLE...WITH SOME STRONG ACTIVITY /NOW OBSERVED IN SRN
   LIVINGSTON COUNTY/...AS THE BOUNDARY ENCOUNTERS LOCAL AREAS NOT YET
   CONVECTIVELY OVERTURNED WITH RESIDUAL VERY STRONG INSTABILITY.
   
   ..PETERS.. 06/05/2011
   
   
   ATTN...WFO...ILN...LMK...IWX...IND...LOT...ILX...LSX...
   
   LAT...LON   40748443 40438404 39828366 39238381 38858566 38728679
               38978786 39268911 39568996 39839015 40238998 40348956
               40508902 40538784 40568679 40808589 41168520 41148492
               40748443