This alert expired on 4 September 2026 at 02:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 33 detections recorded within 20 km of this point since 4 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 8:42PM CDT until September 3 at 9:15PM CDT by NWS Grand Forks ND
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 71 % 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 | 71% |
| Coordinates | 47.3381, -95.6827 |
| Nearest City | Moorhead (97 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-04T01:42:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7af0cfed38313634bc6d3b8863f361893668234c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clearwater, MN; Polk, MN; Red Lake, MN; Beltrami, MN; Clearwater, MN; Marshall, MN; Pennington, MN; Red Lake, MN; Otter Tail, MN |
| Headline | Severe Thunderstorm Warning issued September 3 at 8:42PM CDT until September 3 at 9:15PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T21:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7af0cfed38313634bc6d3b8863f361893668234c.001.1","noaa_urn:oid:2.49.0.1.840.0.0bab736dcf794a3418c3d07597e8c5f24e8c6e2c.001.1","noaa_urn:oid:2.49.0.1.840.0.871efe5bc1a69963553960cbc552fbf606938133.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 16 N Park Rapids |
| Spc County | Hubbard |
| Spc State | MN |
| Spc Comments | Broadcast media relayed report of 1 inch hail 16 miles north of Park Rapids. Time matches when report was relayed to NWS. (FGF) |
| Iem TypeSummary | D |
| Iem City | 3 SE Mcintosh |
| Iem County | Polk |
| Iem State | MN |
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.