⚠️ Severe Thunderstorm Warning – Boone, IA; Hamilton, IA; Hardin, IA; Marshall, IA; Story, IA – Monday, July 20, 2026

Severe Thunderstorm Warning issued July 20 at 6:09PM CDT until July 20 at 7:00PM CDT by NWS Des Moines IA

Details

SVRDMX

The National Weather Service in Des Moines has issued a

* Severe Thunderstorm Warning for…
Story County in central Iowa…
Southwestern Hardin County in central Iowa…
Western Marshall County in central Iowa…
Southeastern Hamilton County in central Iowa…
Eastern Boone County in central Iowa…

* Until 700 PM CDT.

* At 608 PM CDT, a severe thunderstorm was located over Story City,
or 8 miles north of Ames, moving southeast at 30 mph.

HAZARD…Ping pong ball size hail and 60 mph wind gusts.

SOURCE…Radar indicated.

IMPACT…People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.

* Locations impacted include…
Ames, Nevada, Story City, Huxley, Roland, Gilbert, Iowa State
Center, Cambridge, Zearing, McCallsburg, Randall, St. Anthony,
Garden City, and Ames Municipal Airport.

This includes Interstate 35 between mile markers 103 and 131.

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 Iowa.

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