This alert expired on 13 August 2026 at 15:00 UTC. It is kept here as a record.
No stronger detection stands among the 47 recorded within 20 km of this point since 16 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 18 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued August 13 at 9:21AM CDT until August 13 at 10:00AM 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 11, 2026 · score 58 · 14.5 km
- June 18, 2026 · score 28 · 18.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 58 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 81% |
| Coordinates | 41.2133, -91.9550 |
| Nearest City | Ottumwa (44 km) |
| Population Exposed | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T14:21:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jefferson, IA; Keokuk, IA; Washington, IA |
| Headline | Tornado Warning issued August 13 at 9:21AM CDT until August 13 at 10:00AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-08-13T10:00:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 58/100, near Ottumwa (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.