⚠️ Severe Thunderstorm Warning – Boone, IA; Jasper, IA; Marshall, IA; Polk, IA; Story, IA – Tuesday, September 8, 2026

Severe Thunderstorm Warning issued September 8 at 5:50PM CDT until September 8 at 6:30PM 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…
Southern Story County in central Iowa…
Southwestern Marshall County in central Iowa…
Western Jasper County in central Iowa…
Southeastern Boone County in central Iowa…

* Until 630 PM CDT.

* At 550 PM CDT, a severe thunderstorm was located over Alleman, or 7
miles north of Ankeny, moving east at 40 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, Pleasant Hill, Grimes, Nevada, Windsor Heights,
Bondurant, Polk City, Huxley, Saylorville, Madrid, Mitchellville,
Colfax, and Prairie City.

This includes the following highways…
Interstate 35 between mile markers 87 and 111.
Interstate 80 between mile markers 125 and 163.
Interstate 235 between mile markers 5 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.