⚠️ Severe Thunderstorm Warning – Dallas, IA; Madison, IA; Polk, IA; Warren, IA – Monday, July 20, 2026

Severe Thunderstorm Warning issued July 20 at 8:38PM CDT until July 20 at 9:15PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Southwestern Polk County in central Iowa…
Northeastern Madison County in south central Iowa…
Eastern Dallas County in central Iowa…
Northwestern Warren County in south central Iowa…

* Until 915 PM CDT.

* At 838 PM CDT, severe thunderstorms were located along a line
extending from near Dallas Center to near Grimes to near
Saylorville Lake, moving southeast at 35 mph.

HAZARD…60 mph wind gusts and quarter size hail.

SOURCE…Radar indicated.

IMPACT…Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.

* Locations impacted include…
Des Moines, West Des Moines, Ankeny, Urbandale, Johnston, Clive,
Altoona, Waukee, Norwalk, Pleasant Hill, Grimes, Adel, Windsor
Heights, Polk City, Saylorville, Dallas Center, Granger, De Soto,
Van Meter, and Southridge Mall.

This includes the following highways…
Interstate 35 between mile markers 62 and 72, and between mile
markers 87 and 91.
Interstate 80 between mile markers 110 and 142.
Interstate 235 between mile markers 1 and 14.

Instructions

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 1000 PM CDT for central and
south central Iowa.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.