Mesoscale Discussion 1622
   NWS Storm Prediction Center Norman OK
   0936 PM CDT Sun Jul 14 2024

   Areas affected...Northeast Illinois to northern Indiana

   Concerning...Severe potential...Watch possible 

   Valid 150236Z - 150330Z

   Probability of Watch Issuance...60 percent

   SUMMARY...Damaging winds are expected with convection as it
   propagates across northern Illinois (Metro Chicago included) into
   northern Indiana. New Severe Thunderstorm Watch may be required
   immediately downstream.

   DISCUSSION...MCS is gradually growing upscale as it matures over
   southeast WI into northern Illinois. Latest radar data suggests an
   MCV may be forming over Walworth County as a bowing squall line is
   now surging east toward the Chicago Metro. Strong buoyancy extends
   ahead of this complex into northwest IN and LLJ is forecast to
   strengthen into this region over the next few hours. There is
   increasing confidence this MCS will progress beyond ww534 and a new
   watch may be warranted.

   ..Darrow/Gleason.. 07/15/2024

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

   ATTN...WFO...IWX...GRR...IND...LOT...

   LAT...LON   42498757 42238598 41408557 40488623 40938803 41648863
               42498757