Severe Thunderstorm Warning — Marshall County, Iowa
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Current Status
⛈️ Active: Severe Thunderstorm Warning
Severe Thunderstorm Warning issued August 13 at 7:31AM CDT until August 13 at 8:00AM CDT by NWS Des Moines IA
At 730 AM CDT, severe thunderstorms were located along a line extending from 5 miles east of State Center to near Laurel to near Monroe, moving east at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Marshalltown, Newton, Grinnell, Tama, Monroe, State Center, Iowa Speedway, Meskwaki Casino, Rock Creek Lake, Le Grand, Melbourne, Sully, Kellogg, Gilman, Lynnville, Malcom, Montour, Laurel, Haverhill, and Lambs Grove. This includes Interstate 80 between mile markers 160 and 190.
Effective August 13, 2026 at 8:31 AM ET · Expires August 13, 2026 at 9:00 AM ET
Event Details
Event Type
Severe Thunderstorm Warning
Severity
severe
Issued By
NWS Des Moines IA
Expires
August 13, 2026 at 9:00 AM ET
Last Checked
17 minutes ago
What To Do
📋 Official NWS Guidance
Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building.
Also In Effect For
This same Severe Thunderstorm Warning also covers:
Other Active Alerts in Iowa
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Get Severe Thunderstorm Warning Alerts for Marshall County
StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
Frequently Asked Questions
What does a Severe Thunderstorm Warning mean for Marshall County, Iowa?
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Is this Severe Thunderstorm Warning currently active?
Yes — this alert is active as of our last check (17 minutes ago). It's set to expire August 13, 2026 at 9:00 AM ET.
How do I get notified about Severe Thunderstorm Warning alerts for Marshall County?
Download StormCast free on Google Play and set Marshall County, Iowa as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Severe Thunderstorm Warning is also in effect for Poweshiek County, Tama County, Jasper County.