This alert expired on 20 July 2026 at 16:45 UTC. It is kept here as a record.
It is the 90th strongest of the 141 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 11:37AM CDT until July 20 at 11:45AM CDT by NWS Quad Cities IA IL
An estimated 134,727 people live within 50 km of this point.
Nearby, since 11 March 2026
- July 16, 2026 · score 43 · 9.7 km
- July 15, 2026 · score 43 · 9.7 km
- July 14, 2026 · score 43 · 9.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 41.5012, -91.3312 |
| Nearest City | Iowa City (24 km) |
| Population Exposed | 134.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-20T16:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.105ef2a84de64a9ab9cc6164d231312d342d721d.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA; Johnson, IA; Muscatine, IA; Washington, IA |
| Headline | Severe Thunderstorm Warning issued July 20 at 11:37AM CDT until July 20 at 11:45AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-07-20T11:45:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
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 near Iowa City?
Calamity.live data shows a weather event with CalamityScore 43/100, near Iowa City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.