This alert expired on 3 September 2026 at 12:45 UTC. It is kept here as a record.
No stronger detection stands among the 63 recorded within 20 km of this point since 15 March 2026 — 51 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 7:16AM CDT until September 3 at 7:45AM CDT by NWS Bismarck ND
An estimated 49,450 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 29, 2026 · score 40 · 17.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 40 out of 100, at 92 % 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) | 40 / 100 |
| Our confidence | 92% |
| Coordinates | 48.2457, -100.7686 |
| Nearest City | Minot (39 km) |
| Population Exposed | 49.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T12:16:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.d022cecdfb81e0bb29e3bf9eb303b37a38e7a271.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McHenry, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 7:16AM CDT until September 3 at 7:45AM CDT by NWS Bismarck ND |
| Expires | 2026-09-03T07:45:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | 3 NNE Simcoe |
| Spc County | McHenry |
| Spc State | ND |
| Spc Comments | Largest hail size reported. (BIS) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 3 NNE Simcoe |
| Iem County | McHenry |
| Iem State | ND |
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 40/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.