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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 co*plex 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