This alert expired on 21 July 2026 at 03:45 UTC. It is kept here as a record.
It is the 9th strongest of the 30 detections recorded within 20 km of this point since 19 May 2026. The last comparable one was on 11 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 9:53PM CDT until July 20 at 10:45PM CDT by NWS Des Moines IA
An estimated 370,206 people live within 50 km of this point.
Nearby, since 19 May 2026
- June 6, 2026 · score 67 · 25.5 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 80 % 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) | 37 / 100 |
| Our confidence | 80% |
| Coordinates | 41.2334, -93.5001 |
| Nearest City | Indianola (15 km) |
| Population Exposed | 370.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T02:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f6bf2925517fdf90b468fe906647c8f5 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Appanoose, IA; Lucas, IA; Monroe, IA; Wayne, IA; Dallas, IA; Madison, IA; Polk, IA; Warren, IA |
| Headline | Severe Thunderstorm Warning issued July 20 at 9:53PM CDT until July 20 at 10:45PM CDT by NWS Des Moines IA |
| Expires | 2026-07-20T22:45:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f6bf2925517fdf90b468fe906647c8f5ad1176b4.001.1","noaa_urn:oid:2.49.0.1.840.0.2e8a6c4b01793c45ee466ca5866c1236e19c57e4.001.1"] |
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 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 Indianola?
Calamity.live data shows a weather event with CalamityScore 37/100, near Indianola (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.