This alert expired on 4 September 2026 at 00:15 UTC. It is kept here as a record.
No stronger detection stands among the 14 recorded within 20 km of this point since 5 April 2026 — 2 others scored the same. The last comparable one was on 17 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 6:22PM CDT until September 3 at 7:15PM CDT by NWS Grand Forks ND
An estimated 57,011 people live within 50 km of this point.
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 32 out of 100, at 91 % 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) | 32 / 100 |
| Our confidence | 91% |
| Coordinates | 48.2021, -97.1968 |
| Nearest City | Grand Forks (33 km) |
| Population Exposed | 57.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T23:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6341c4a6e3e1eae9ae6aaebaf1d207f755c54ace.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grand Forks, ND; Walsh, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 6:22PM CDT until September 3 at 7:15PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T19:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | Warren |
| Spc County | Marshall |
| Spc State | MN |
| Spc Comments | Estimated winds up to 60mph with pea sized hail. (FGF) |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | Warren |
| Iem County | Marshall |
| 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 32/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.