This alert expired on 3 September 2026 at 22:00 UTC. It is kept here as a record.
It is the 15th strongest of the 26 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 4:06PM CDT until September 3 at 5:00PM CDT by NWS Grand Forks ND
Nearby, since 3 April 2026
- July 25, 2026 · score 46 · 7.3 km
- August 4, 2026 · score 22 · 10.6 km
- July 25, 2026 · score 46 · 20.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % 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 | 66% |
| Coordinates | 47.7816, -95.0752 |
| Nearest City | Grand Forks (147 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T21:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.fadfd8cc1fc898501fbdd7b1823186e8cdb5a37c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Beltrami, MN; Clearwater, MN; Becker, MN; Beltrami, MN; Clearwater, MN; Hubbard, MN; Mahnomen, MN; Otter Tail, MN; Polk, MN; Wadena, MN; Beltrami, MN; Lake of the Woods, MN; Roseau, MN |
| Headline | Severe Thunderstorm Warning issued September 3 at 4:06PM CDT until September 3 at 5:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T17:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fadfd8cc1fc898501fbdd7b1823186e8cdb5a37c.001.1","noaa_urn:oid:2.49.0.1.840.0.6e13bae70b3dbb4e0b79f16b381b4f26f3013f8b.001.1","noaa_urn:oid:2.49.0.1.840.0.e77e0f2b47868d6f56b213f227736b393b38795c.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 3 SE Mcintosh |
| Spc County | Polk |
| Spc State | MN |
| Spc Comments | Off duty NWS employee reported branches up to 4 inches in diameter being knocked down... on and off pea to half inch hail for last 5 minutes. Location estimated 3 SE of (FGF) |
| MergedSources | [{"id":"spc_wind_47.60_-95.78_62","source":"spc","severity":"medium","severityValue":45,"timestamp":1788466920000,"latitude":47.6,"longitude":-95.78},{"id":"spc_wind_47.52_-95.66_63","source":"spc","severity":"medium","severityValue":45,"timestamp":1788467100000,"latitude":47.52,"longitude":-95.66},{"id":"spc_wind_47.61_-95.83_64","source":"spc","severity":"medium","severityValue":45,"timestamp":1788467220000,"latitude":47.61,"longitude":-95.83}] |
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.
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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.