ACUS11 KWNS 142336
SWOMCD
SPC MCD 142336=20
ILZ000-WIZ000-IAZ000-150130-

Mesoscale Discussion 0431
NWS Storm Prediction Center Norman OK
0636 PM CDT Tue Apr 14 2026

Areas affected...Northeast Iowa into south-central Wisconsin

Concerning...Tornado Watch 109...

Valid 142336Z - 150130Z

The severe weather threat for Tornado Watch 109 continues.

SUMMARY...Tornadoes and large/very-large hail remain possible this
evening, particularly with discrete supercell elements. The greatest
tornado threat this evening will likely be in far eastern Iowa and
northern Illinois where the low-level jet will be strongest.

DISCUSSION...Rotation remains evident on local radar velocity data
with two supercells in southwest Wisconsin and east-central Iowa.
The KDVN VAD shows enlarged hodographs and 0-3 SRH approaching 500
m2/s2. Additional strengthening of the low-level jet is expected,
especially in far eastern Iowa and northern Illinois. The KDVN
observed sounding from 21Z also showed a near 8 C/km mid-level lapse
rate and 52 kts of effective shear. Large to very-large hail will
remain possible with any supercell. The tornado threat will
similarly be contingent on maintaining a discrete storm mode. The
southern supercell will be moving into the better low-level shear
environment with time. A strong tornado would be possible with any
discrete storm within that environment.=20

Farther north into southern Wisconsin, another round of severe
storms is expected in the next 2-3 hours. Tornadoes and
large/very-large hail will also be possible, though storm
interaction are more likely here as well as potential impacts from
earlier supercell outflow.

..Wendt.. 04/14/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-xB9bm5ozgyZKvV4ciWJxIDVWqIwkfrXvIOAiLv9V0s33dH2H92LBFq_s722cl0wbsv7-Pp9t= GyqUNbWPhuu8nmZEao$ for graphic product...

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

LAT...LON 41909044 41929088 41979129 42179139 42499126 43169041
43298946 43278936 42378883 42008898 41898968 41909044=20

MOST PROBABLE PEAK TORNADO INTENSITY...140-170 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...2.75-4.25 IN


=3D =3D =3D
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