ACUS11 KWNS 172256
SWOMCD
SPC MCD 172255=20
WIZ000-ILZ000-IAZ000-180030-

Mesoscale Discussion 1170
NWS Storm Prediction Center Norman OK
0555 PM CDT Wed Jun 17 2026

Areas affected...Parts of southwest WI and vicinity

Concerning...Tornado Watch 346...

Valid 172255Z - 180030Z

The severe weather threat for Tornado Watch 346 continues.

SUMMARY...Ongoing tornado potential may continue through early
evening. Isolated hail and damaging wind are also possible.

DISCUSSION...A noticeable uptick in storm organization has recently
occurred across extreme northeast IA, with supercell evolution and
development of a relatively long-lived tornado. The embedded
supercell is now moving into southwest WI. While instability remains
rather modest, favorable deep-layer shear and proximity to low-level
vorticity in the vicinity of a surface low has helped to increase
tornado potential, and some tornado threat may spread across a
larger portion of southwest WI through early evening, where some
modest airmass recovery has occurred. A Tornado Watch was recently
issued in order to address the short-term tornado threat. Isolated
hail and damaging wind also remain possible.

..Dean.. 06/17/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!7B0BuN7Dv0P1tcgMExWeX6JgJkpejzwt6yIhMYMliLolw-BccagXEbd6wsB4dIX2BdczZPLlC= pTyZyMjMxE9YfFrjH4$ for graphic product...

ATTN...WFO...MKX...DVN...ARX...

LAT...LON 43069104 43269065 43279013 43028970 42728970 42428985
42449025 42479053 42549074 42629096 42739122 42909125
43069104=20

MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


=3D =3D =3D
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