This alert expired on 3 September 2026 at 20:15 UTC. It is kept here as a record.
No stronger detection stands among the 35 recorded within 20 km of this point since 31 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 2:32PM CDT until September 3 at 3:15PM CDT by NWS Grand Forks ND
An estimated 57,011 people live within 50 km of this point.
Nearby, since 31 March 2026
- July 30, 2026 · score 39 · 21.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 45 out of 100, at 90 % 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) | 45 / 100 |
| Our confidence | 90% |
| Coordinates | 47.7458, -96.9576 |
| Nearest City | Grand Forks (21 km) |
| Population Exposed | 57.0K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T19:32:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.101d77e064688da464ece193178008de3fd23adf.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cass, ND; Traill, ND; Marshall, MN; Norman, MN; Pennington, MN; Polk, MN; Red Lake, MN; Traill, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 2:32PM CDT until September 3 at 3:15PM CDT by NWS Grand Forks ND |
| Expires | 2026-09-03T15:15:00-05:00 |
| SenderName | NWS Grand Forks ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.101d77e064688da464ece193178008de3fd23adf.002.1","noaa_urn:oid:2.49.0.1.840.0.ec22c34ff9b5de1942957b3a044d50d1cf652e14.002.1"] |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | Finley |
| Spc County | Steele |
| Spc State | ND |
| Spc Comments | (FGF) |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | Warren |
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 near Grand Forks?
Calamity.live data shows a weather event with CalamityScore 45/100, near Grand Forks (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.