Mesoscale Discussion 2023
   NWS Storm Prediction Center Norman OK
   0939 PM CDT Tue Aug 27 2024

   Areas affected...Parts of northern IL into extreme northwest IN

   Concerning...Severe Thunderstorm Watch 658...

   Valid 280239Z - 280415Z

   The severe weather threat for Severe Thunderstorm Watch 658
   continues.

   SUMMARY...Some threat for hail and damaging wind may persist through
   late evening.

   DISCUSSION...Convection has largely become outflow dominant this
   evening across northern IL, within an environment that is strongly
   unstable (with MLCAPE of 3000-4000 J/kg), but with only weak to
   marginal deep-layer shear. Favorable thermodynamic profiles (as
   noted on the 00Z ILX/DVN soundings) will continue to support briefly
   intense updrafts with isolated hail potential. A large area of
   convective outflow has moved into western IL from northeast
   MO/southeast IA, with smaller outflows being generated by
   redeveloping storms within the primary instability axis. Locally
   damaging winds may accompany this outflow-dominant convection
   through late evening, before increasingly extensive convective
   overturning results in a weakening trend overnight.

   ..Dean.. 08/28/2024

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...LOT...ILX...DVN...

   LAT...LON   41079060 41458884 41528784 41558737 41418713 41118715
               40818752 40538853 40428999 40439026 40509056 41079060