This alert expired on 4 September 2026 at 05:30 UTC. It is kept here as a record.
It is the 8th strongest of the 77 detections recorded within 20 km of this point since 2 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 12:01AM CDT until September 4 at 12:30AM CDT by NWS Duluth MN
An estimated 16,204 people live within 50 km of this point.
Nearby, since 2 April 2026
- July 4, 2026 · score 34 · 6.0 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 82 % 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) | 28 / 100 |
| Our confidence | 82% |
| Coordinates | 47.1657, -93.3700 |
| Nearest City | Hibbing (44 km) |
| Population Exposed | 16.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T05:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.95aeea656887d519f6f377bf17fbfe3d6421fd3c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Aitkin, MN; Cass, MN; Itasca, MN; St. Louis, MN |
| Headline | Severe Thunderstorm Warning issued September 4 at 12:01AM CDT until September 4 at 12:30AM CDT by NWS Duluth MN |
| Expires | 2026-09-04T00:30:00-05:00 |
| SenderName | NWS Duluth MN |
| 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 in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.