This alert expired on 3 September 2026 at 21:15 UTC. It is kept here as a record.
It is the 13th strongest of the 74 detections recorded within 20 km of this point since 3 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 3:14PM CDT until September 3 at 4:15PM CDT by NWS Grand Forks ND
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 71% |
| Coordinates | 47.5261, -96.0821 |
| Nearest City | Grand Forks (84 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T20:14:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.bbc241d5ee731bf9014be12ccceebff8a0503757.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Becker, MN; Clay, MN; Clearwater, MN; Mahnomen, MN; Norman, MN; Polk, MN; Clay, MN; Norman, MN; Mahnomen, MN; Marshall, MN; Norman, MN; Pennington, MN; Polk, MN; Red Lake, MN; Traill, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 3:14PM CDT until September 3 at 4:15PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T16:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bbc241d5ee731bf9014be12ccceebff8a0503757.001.1","noaa_urn:oid:2.49.0.1.840.0.d68f9840b71854710a6f02b0ad372d1981faa5b0.001.1","noaa_urn:oid:2.49.0.1.840.0.9f03c49bddd597eab0e0e70aea65c32edfb7f1b3.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 63 |
| Spc Location | 4 NE Fertile |
| Spc County | Polk |
| Spc State | MN |
| Spc Comments | Personal weather station measurement. (FGF) |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 4 NNW Fertile |
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 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.