ACUS11 KWNS 202237
SWOMCD
SPC MCD 202237
ILZ000-IAZ000-202330-

Mesoscale Discussion 1678
NWS Storm Prediction Center Norman OK
0537 PM CDT Mon Jul 20 2026

Areas affected...southeast Iowa into northwest Illinois

Concerning...Tornado Watch 500...

Valid 202237Z - 202330Z

The severe weather threat for Tornado Watch 500 continues.

SUMMARY...The potential for damaging winds with gusts of 70-80 mph
are expected to move out of the watch area within the hour and an
additional watch is being coordinated.

DISCUSSION...As of 2230Z, a bow echo was approaching I-80, west of
Iowa City with a forward motion of 45-50 mph. Extrapolation takes
the convective system out of Tornado Watch 500 within the hour,
requiring the issuance of a downstream watch. The primary hazard is
severe winds with gusts up to 70-80 mph.

..Mead.. 07/20/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!-itHLDrEElqMfTnfKLgmSGVs6m1noQy3QDW9p6n4cBvswqeA5dzOWO7f9DFiGSfqqi_3ozTiHeAJTrK7YfFQfi9Ifos$ for graphic product...

ATTN...WFO...ILX...DVN...DMX...

LAT...LON 40729141 41279220 41979239 42399162 41789019 40808933
40168924 40039005 40439119 40729141

MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


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