This alert expired on 13 August 2026 at 12:15 UTC. It is kept here as a record.
It is the 7th strongest of the 86 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 12 August 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 13 at 6:27AM CDT until August 13 at 7:15AM CDT by NWS Des Moines IA
An estimated 531,549 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 3, 2026 · score 41 · 3.1 km
- July 21, 2026 · score 41 · 3.8 km
- July 2, 2026 · score 48 · 6.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 81% |
| Coordinates | 41.8786, -93.5357 |
| Nearest City | Ankeny (18 km) |
| Population Exposed | 531.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T11:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.572e417a8f1eaf4a4f69b117d031887ddd16bf8a.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Boone, IA; Dallas, IA; Jasper, IA; Marshall, IA; Polk, IA; Story, IA |
| Headline | Severe Thunderstorm Warning issued August 13 at 6:27AM CDT until August 13 at 7:15AM CDT by NWS Des Moines IA |
| Expires | 2026-08-13T07:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| 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 Ankeny?
Calamity.live data shows a weather event with CalamityScore 48/100, near Ankeny (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.