Right now
The most recent data we hold from NOAA arrived 11 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
20 other detections within 20 km in the last 24 hours, the nearest 12 km from here.
This alert expired on 4 September 2026 at 21:00 UTC. It is kept here as a record.
It is the 90th strongest of the 108 detections recorded within 20 km of this point since 14 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 4 at 3:44PM CDT until September 4 at 4:00PM CDT by NWS Des Moines IA
An estimated 109,715 people live within 50 km of this point.
Nearby, since 14 April 2026
- September 4, 2026 · score 49 · 12.0 km
- September 5, 2026 · score 49 · 13.8 km
- May 16, 2026 · score 43 · 18.2 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 v4. 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 | 42.6280, -92.6660 |
| Nearest City | Cedar Falls (21 km) |
| Population Exposed | 109.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T20:44:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.03b513af3dbe499a9754c7532ec3c1966e554073.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Butler, IA |
| Headline | Severe Thunderstorm Warning issued September 4 at 3:44PM CDT until September 4 at 4:00PM CDT by NWS Des Moines IA |
| Expires | 2026-09-04T16:00:00-05:00 |
| 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 Cedar Falls?
Calamity.live data shows a weather event with CalamityScore 37/100, near Cedar Falls (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.