This alert expired on 28 June 2026 at 13:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 22 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 28 at 7:41AM CDT until June 28 at 8:00AM CDT by NWS Des Moines IA
Nearby, since 15 March 2026
- September 3, 2026 · score 16 · 16.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 65 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 65% |
| Coordinates | 43.2157, -94.2471 |
| Nearest City | Fort Dodge (80 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-28T12:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a7c039a65d21fe29e83db704ad063af43c9bb5a6.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hancock, IA; Humboldt, IA; Kossuth, IA; Palo Alto, IA; Pocahontas, IA; Winnebago, IA |
| Headline | Severe Thunderstorm Warning issued June 28 at 7:41AM CDT until June 28 at 8:00AM CDT by NWS Des Moines IA |
| Expires | 2026-06-28T08:00:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | Webb |
| Iem County | Clay |
| Iem State | IA |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_42.950_-95.010_1782648840000","source":"iem","severity":"low","severityValue":25,"timestamp":1782648840000,"latitude":42.95,"longitude":-95.01}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.