This alert expired on 4 July 2026 at 09:30 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 16 March 2026 — 4 others scored the same. 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 July 4 at 3:42AM CDT until July 4 at 4:30AM CDT by NWS Quad Cities IA IL
An estimated 24,624 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 14, 2026 · score 28 · 18.0 km
- June 18, 2026 · score 28 · 21.7 km
- June 13, 2026 · score 28 · 24.6 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 91% |
| Coordinates | 41.2750, -92.3691 |
| Nearest City | Ottumwa (29 km) |
| Population Exposed | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T08:42:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Iowa, IA; Keokuk, IA; Appanoose, IA; Davis, IA; Lucas, IA; Mahaska, IA; Monroe, IA; Wapello, IA |
| Headline | Severe Thunderstorm Warning issued July 4 at 3:42AM CDT until July 4 at 4:30AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-07-04T04:30:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cca386e81dcdf0cb49867e85aceada7f9387d581.001.1","noaa_urn:oid:2.49.0.1.840.0.a13ebc4e6baee896c038d19b5c36c2b4489a69c0.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 3 ENE Searsboro |
| Iem County | Poweshiek |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | PWS gust. |
| MergedSources | [{"id":"iem_G_41.300_-93.110_1783150800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783150800000,"latitude":41.3,"longitude":-93.11},{"id":"iem_G_41.600_-92.650_1783151880000","source":"iem","severity":"low","severityValue":25,"timestamp":1783151880000,"latitude":41.6,"longitude":-92.65}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 34/100, near Ottumwa (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.