ACUS11 KWNS 242228
SWOMCD
SPC MCD 242228=20
WIZ000-MIZ000-ILZ000-IAZ000-250000-

Mesoscale Discussion 1297
NWS Storm Prediction Center Norman OK
0528 PM CDT Wed Jun 24 2026

Areas affected...portions of the western Great Lakes region

Concerning...Severe Thunderstorm Watch 387...

Valid 242228Z - 250000Z

The severe weather threat for Severe Thunderstorm Watch 387
continues.

SUMMARY...The risk for primarily large hail and damaging wind gusts
continues across Severe Thunderstorm Watch 387. A brief tornado or
two also remain possible.

DISCUSSION...Regional radar imagery depicts widely scattered
thunderstorms ongoing from northern Wisconsin southward into
northern Illinois, with a mixed mode of supercells and clusters
noted as of 2220 UTC. This convection has produced several reports
of large hail (up to 1.25" in diameter) over the past 1-2 hours,
with sporadic reports of wind damage and brief funnel clouds also
received. This risk will persist over the next couple of hours as
convection evolves east-southeastward towards Lake Michigan.=20

The greatest severe potential appears to exist across the southern
half of the Severe Thunderstorm Watch area, where greater buoyancy
exists within the hail growth zone, which may promote an instance or
two of large hail approaching golf ball size. Modestly steeper
low-level lapse rates will also continue to promote the potential
for damaging wind gusts. Lastly, a brief tornado or two cannot be
ruled out, especially where low-level SRH is modestly enhanced in
the vicinity of the lake breeze.

..Chalmers.. 06/24/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4Af03odl3LuUsXcrY0FpbyZTK2vmTX8XZpkWcydmv7haMP3Qo9XIdEz5dqUX_ttGM3KMOhKCs= eXT7aan3MldwQP21N4$ for graphic product...

ATTN...WFO...MQT...GRB...LOT...MKX...DVN...DLH...ARX...

LAT...LON 41858754 41708792 41628917 41758991 41889014 41989025
42779068 43559071 44849050 44929046 45908958 46168843
46138778 45798742 44658746 43248770 42078742 41858754=20

MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


=3D =3D =3D
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