This alert expired on 4 September 2026 at 03:00 UTC. It is kept here as a record.
It is the 129th strongest of the 186 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 3 at 7:57PM CDT until September 3 at 10:00PM CDT by NWS Grand Forks ND
An estimated 16,788 people live within 50 km of this point.
Nearby, since 15 March 2026
- September 4, 2026 · score 28 · 0.0 km
- September 3, 2026 · score 28 · 0.0 km
- September 2, 2026 · score 28 · 0.0 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 | 46.0000, -94.3000 |
| Nearest City | Sartell (43 km) |
| Population Exposed | 16.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T00:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.ce482bc5b6d028e9f10ab5f1af08e1a24f31cbae.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Otter Tail, MN; Wadena, MN; Becker, MN; Beltrami, MN; Clay, MN; Clearwater, MN; Hubbard, MN; Mahnomen, MN; Marshall, MN; Norman, MN; Pennington, MN; Polk, MN; Red Lake, MN; Barnes, ND; Cass, ND; Aitkin, MN; Carlton, MN; Cass, MN; Crow Wing, MN; Itasca, MN; Koochiching, MN; St. Louis, MN |
| Headline | Severe Thunderstorm Watch issued September 3 at 7:57PM CDT until September 3 at 10:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T22:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | false |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ce482bc5b6d028e9f10ab5f1af08e1a24f31cbae.001.1","noaa_urn:oid:2.49.0.1.840.0.ce482bc5b6d028e9f10ab5f1af08e1a24f31cbae.002.1","noaa_urn:oid:2.49.0.1.840.0.b25e9edf79e6a94b3e0326aea166f6670313dd07.001.1"] |
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 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.