ACUS11 KWNS 202134
SWOMCD
SPC MCD 202134
IAZ000-202330-

Mesoscale Discussion 1676
NWS Storm Prediction Center Norman OK
0434 PM CDT Mon Jul 20 2026

Areas affected...central and eastern Iowa

Concerning...Tornado Watch 500...

Valid 202134Z - 202330Z

The severe weather threat for Tornado Watch 500 continues.

SUMMARY...A corridor of enhanced damaging wind potential with gusts
of 70-80 mph appears to be evolving from the Waterloo vicinity
towards Iowa City. A few tornadoes and isolated occurrences of large
hail are also possible.

DISCUSSION...Initial more discrete supercells have evolved into a
bowing complex with embedded HP supercells near and southwest of
Waterloo as of 2125Z. The storm complex is largely situated on the
immediate cool side of a north-south-oriented outflow boundary
within a zone of locally backed near-surface winds, which are
enhancing both low-level and deep-layer shear. Extrapolation of
current storm motion and latest WoFS forecasts suggest that a
corridor of enhanced damaging wind potential and some tornado risk
will spread southeast toward Iowa City over the next 1-1.5 hours.
Isolated occurrences of large hail will also be possible given the
embedded supercell structures.

..Mead.. 07/20/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!_JRk8JxcsO6yHoHCWraQ14MhNP6HdGqkbWGhjcafGseX1GyRqjZ7kfyI14OT5nOLdaJ1KPi97L4Vmc0HsIbqtuVOi1o$ for graphic product...

ATTN...WFO...DVN...ARX...DMX...

LAT...LON 41199253 41769301 42289323 42669330 42899283 42869225
42269147 41559131 41169119 40909149 40949218 41199253

MOST PROBABLE PEAK TORNADO INTENSITY...120-145 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN


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--- scorpsmtpd
* Origin: capitolcityonline.net * KY, USA (1:2320/107)