⚠️ Severe Thunderstorm Warning – Boone, IA; Dallas, IA; Jasper, IA; Marshall, IA; Polk, IA; Story, IA – Thursday, August 13, 2026

Severe Thunderstorm Warning issued August 13 at 6:27AM CDT until August 13 at 7:15AM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Polk County in central Iowa…
Story County in central Iowa…
Western Marshall County in central Iowa…
Northwestern Jasper County in central Iowa…
Eastern Boone County in central Iowa…
Eastern Dallas County in central Iowa…

* Until 715 AM CDT.

* At 626 AM CDT, severe thunderstorms were located along a line
extending from near Boone to Big Creek State Park to 4 miles north
of Earlham, moving east at 55 mph.

HAZARD…60 mph wind gusts.

SOURCE…Radar indicated.

IMPACT…Expect damage to roofs, siding, and trees.

* Locations impacted include…
Des Moines, Ames, West Des Moines, Ankeny, Urbandale, Johnston,
Clive, Altoona, Waukee, Boone, Pleasant Hill, Grimes, Nevada, Adel,
Windsor Heights, Carlisle, Bondurant, Polk City, Huxley, and
Saylorville.

This includes the following highways…
Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 121.
Interstate 80 between mile markers 107 and 160.
Interstate 235 between mile markers 1 and 14.

Instructions

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

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