This alert expired on 4 September 2026 at 04:00 UTC. It is kept here as a record.
It is the 4th strongest of the 50 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 3 at 10:24PM CDT until September 3 at 11:00PM CDT by NWS Grand Forks ND
Nearby, since 2 April 2026
- June 24, 2026 · score 46 · 12.2 km
- June 23, 2026 · score 46 · 13.0 km
- July 3, 2026 · score 22 · 19.8 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 72 % 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 | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 72% |
| Coordinates | 47.2750, -95.2550 |
| Nearest City | Moorhead (123 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-04T03:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.ce676fb455e7e996575dcbbe2d359f7bc5660fa9.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hubbard, MN; Mahnomen, MN |
| Headline | Severe Thunderstorm Warning issued September 3 at 10:24PM CDT until September 3 at 11:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T23:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ce676fb455e7e996575dcbbe2d359f7bc5660fa9.001.1","noaa_urn:oid:2.49.0.1.840.0.2e831716f83851fb70227a99f269f266e9e69eb6.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 125 |
| Spc Location | 4 SSE Bagley |
| Spc County | Clearwater |
| Spc State | MN |
| Spc Comments | mPing of half dollar sized hail. (FGF) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 16 N Park Rapids |
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.