This alert expired on 21 July 2026 at 02:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 25 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 8:28PM CDT until July 20 at 9:15PM CDT by NWS Quad Cities IA IL
An estimated 24,624 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 11, 2026 · score 40 · 7.5 km
- March 10, 2026 · score 40 · 11.1 km
- June 13, 2026 · score 28 · 21.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 80 % 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) | 28 / 100 |
| Our confidence | 80% |
| Coordinates | 40.9365, -92.4123 |
| Nearest City | Ottumwa (9 km) |
| Population Exposed | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T01:28:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hancock, IL; McDonough, IL; Lee, IA; Lucas, IA; Mahaska, IA; Marion, IA; Monroe, IA; Marion, IA |
| Headline | Severe Thunderstorm Warning issued July 20 at 8:28PM CDT until July 20 at 9:15PM CDT by NWS Quad Cities IA IL |
| Expires | 2026-07-20T21:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1814b3b03a4673af1b2fabaafde1cee6c6f0c687.001.1","noaa_urn:oid:2.49.0.1.840.0.76dac2bf11e0af701b3c572b18982e626a5dbf8e.001.1","noaa_urn:oid:2.49.0.1.840.0.7813c65167abe9802cde105b23ee4f7adf02fc27.002.1"] |
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.
Calamity.live data shows a weather event with CalamityScore 28/100, near Ottumwa (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.