This alert expired on 3 September 2026 at 19:00 UTC. It is kept here as a record.
It is the 4th strongest of the 17 detections recorded within 20 km of this point since 3 April 2026. The last comparable one was on 31 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 12:55PM CDT until September 3 at 2:00PM 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 | 47.6430, -97.5532 |
| Nearest City | Grand Forks (50 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T17:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.eb5f6f45defd790e8f8dc6da45a4972ce02067b2.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Griggs, ND; Steele, ND; Norman, MN; Polk, MN; Grand Forks, ND; Steele, ND; Traill, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 12:55PM CDT until September 3 at 2:00PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T14:00:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eb5f6f45defd790e8f8dc6da45a4972ce02067b2.001.1","noaa_urn:oid:2.49.0.1.840.0.cf72c3cbd69e7bf5e079667a5e837f1ddca1ff12.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 71 |
| Spc Location | 2 ESE Lakota |
| Spc County | Nelson |
| Spc State | ND |
| Spc Comments | NDDOT sensor near Lakota. (FGF) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | Finley |
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.