ACUS11 KWNS 101800
SWOMCD
SPC MCD 101800=20
WIZ000-ILZ000-IAZ000-MNZ000-102000-

Mesoscale Discussion 1066
NWS Storm Prediction Center Norman OK
0100 PM CDT Wed Jun 10 2026

Areas affected...southern Wisconsin and northern Illinois

Concerning...Severe Thunderstorm Watch 301...

Valid 101800Z - 102000Z

The severe weather threat for Severe Thunderstorm Watch 301
continues.

SUMMARY...An arcing line of thunderstorms has organized in eastern
Iowa and will move northeastward for the next few hours through WW
301. The threat for severe wind gusts is greatest in the delineated
area as the system moves through.

DISCUSSION...A line of severe thunderstorms has developed in eastern
IA and is moving northeastward into southern WI and northern IL. A
64-kt wind gust was reported at 1740z in Dubuque, IA associated with
this convection. Difluence aloft and low-level convergence along the
leading edge of a ~10-F-deficit cold pool have likely contributed to
storm strengthening during the last hour or so. Per current
mesoanalysis, the line of storms is moving into a CAPE axis
stretching from central IN northwestward into southeastern MN,
featuring 2500+ J/kg along the WI/IL border. Bulk shear magnitudes
are around 40 kts and southwesterly, oriented perpendicular to the
convective line. This environment will support a threat for
continued severe wind gusts as the system moves northeast for the
next few hours.

..Flournoy.. 06/10/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!5izQUAv84be9A7nJVJQdA2X944sJwM3o-01KnaHU-48WhkMzs2-Jaq9JB0UPHelINf1AAMjrg= MNgEQEKJrcf_eATNvE$ for graphic product...

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

LAT...LON 42909185 43639117 44029026 44198911 43798795 42698784
42008854 41379002 42289068 42909185=20

MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


=3D =3D =3D
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