This alert expired on 3 September 2026 at 12:45 UTC. It is kept here as a record.
No stronger detection stands among the 57 recorded within 20 km of this point since 15 March 2026 — 41 others scored the same. The last comparable one was on 30 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 7:01AM 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
- September 3, 2026 · score 40 · 8.6 km
- June 29, 2026 · score 40 · 20.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 40 out of 100, at 86 % 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 | 86% |
| Coordinates | 48.2150, -100.7767 |
| Nearest City | Minot (39 km) |
| Population Exposed | 49.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T12:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.32be25a065f5a844c4709398182079204991baf0.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McHenry, ND |
| Headline | Severe Thunderstorm Warning issued September 3 at 7:01AM 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) |
| MergedSources | [{"id":"spc_hail_48.20_-100.84_1","source":"spc","severity":"high","severityValue":65,"timestamp":1788436800000,"latitude":48.2,"longitude":-100.84}] |
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.