This alert expired on 7 August 2026 at 23:30 UTC. It is kept here as a record.
It is the 42nd strongest of the 66 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 7 at 5:57PM CDT until August 7 at 6:30PM CDT by NWS Quad Cities IA IL
An estimated 302,462 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 11, 2026 · score 43 · 7.3 km
- July 11, 2026 · score 43 · 13.2 km
- July 11, 2026 · score 43 · 13.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 77 % 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) | 37 / 100 |
| Our confidence | 77% |
| Coordinates | 41.8208, -91.1554 |
| Nearest City | Iowa City (36 km) |
| Population Exposed | 302.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-07T22:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.71cf7b4ad7ca6a403f64344546c66b21 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA; Clinton, IA; Iowa, IA; Johnson, IA; Linn, IA |
| Headline | Severe Thunderstorm Warning issued August 7 at 5:57PM CDT until August 7 at 6:30PM CDT by NWS Quad Cities IA IL |
| Expires | 2026-08-07T18:30:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.71cf7b4ad7ca6a403f64344546c66b21ac9a7808.001.1","noaa_urn:oid:2.49.0.1.840.0.bdc416fadbe2e654b8501e9a48d1dd9adf2ffe28.002.1"] |
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.
Want to know when something happens near Iowa City?
Calamity.live data shows a weather event with CalamityScore 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.