MESOSCALE DISCUSSION 2111
   NWS STORM PREDICTION CENTER NORMAN OK
   0502 PM CDT SAT SEP 03 2011
   
   AREAS AFFECTED...NRN/CNTRL IL...NRN IND...SRN MI...FAR NWRN OH
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 829...
   
   VALID 032202Z - 032300Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 829
   CONTINUES.
   
   MULTICELLULAR CLUSTERS AND SMALL BOWING SEGMENTS WILL CONTINUE TO
   PRODUCE DMGG WIND AND LARGE HAIL ACROSS THE WW AREA.
   
   STRONG TO SEVERE THUNDERSTORMS CONTINUE TO DEVELOP ALONG A WAVY
   STATIONARY FRONT NEAR DETROIT...SOUTH OF CHICAGO...NORTH OF ST
   LOUIS...TO NORTHWEST OK. ADDITIONAL DEVELOPMENT IS OCCURRING ALONG A
   SERIES OF RESIDUAL OUTFLOW BOUNDARIES...NOTED ON 2145Z VISIBLE
   IMAGERY SOUTH OF LANSING MI SWWD TO NEAR SPRINGFIELD IL...WHILE A
   SEPARATE ONE EXTENDS FROM NEAR CHICAGO IL WSWWD TO ST LOUIS MO INTO
   E CNTRL KS.
   
   DEEP-LAYER FLOW /PER AREA PROFILER DATA/ CONTINUES TO GRADUALLY
   INCREASE ATTENDANT TO AN APPROACHING UPPER TROUGH. THE ASSOCIATED
   INCREASE IN LOW LEVEL WINDS MAY AID IN DMGG WIND POTENTIAL AND THE
   DEVELOPMENT OF SMALL BOWING SEGMENTS IN A VERY STEEP LOW LEVEL LAPSE
   RATE ENVIRONMENT. THIS IS FURTHER SUPPORTED BY THE 19Z DETROIT
   SOUNDING...WITH OBSERVED 0-3 KM AGL LAPSE RATES NEAR 9.5 C/KM. AMPLE
   DESTABILIZATION HAS OCCURRED AS TEMPERATURES HAVE WARMED INTO THE
   UPPER 80S TO MID 90S...AND SHOULD SUPPORT A CONTINUATION OF STRONG
   TO SEVERE STORMS THROUGHOUT THE WW CORRIDOR.
   
   ..HURLBUT.. 09/03/2011
   
   
   ATTN...WFO...CLE...DTX...IWX...GRR...IND...LOT...ILX...LSX...
   DVN...
   
   LAT...LON   40239141 40659119 41369107 41329043 41599027 41638868
               42158853 42218635 42468615 42438515 42758503 42798443
               43128430 43148388 43248379 43278328 43628312 43668263
               43828256 43838217 43618221 42798246 42418293 42018321
               41678342 41518389 41248556 41008575 40948615 40608621
               40608644 40718648 40768679 40558674 40598709 40498705
               40528787 40418791 40428846 40288842 40348963 40108959
               40109012 40019044 40009059 40139093 40239141