Severe Thunderstorm Warning — Clayton 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 18 at 3:08PM CDT until August 18 at 3:30PM CDT by NWS La Crosse WI
At 308 PM CDT, a severe thunderstorm was located over Guttenberg, moving southeast at 25 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. This severe thunderstorm will remain over mainly rural areas of southeastern Clayton and west central Grant Counties, including the following locations... Lock And Dam 10, Glen Haven, County Roads X 47 And C 7 X, Osterdock, and Millville.
Effective August 18, 2026 at 4:08 PM ET · Expires August 18, 2026 at 4:30 PM ET
Event Details
Event Type
Severe Thunderstorm Warning
Severity
severe
Issued By
NWS La Crosse WI
Expires
August 18, 2026 at 4:30 PM ET
Last Checked
4 hours ago
What To Do
📋 Official NWS Guidance
For your protection move to an interior room on the lowest floor of a building.
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Get Severe Thunderstorm Warning Alerts for Clayton County
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Frequently Asked Questions
What does a Severe Thunderstorm Warning mean for Clayton 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 (4 hours ago). It's set to expire August 18, 2026 at 4:30 PM ET.
How do I get notified about Severe Thunderstorm Warning alerts for Clayton County?
Download StormCast free on Google Play and set Clayton 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.