This alert expired on 3 September 2026 at 14:30 UTC. It is kept here as a record.
No stronger detection stands among the 82 recorded within 20 km of this point since 15 March 2026 — 44 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 3 at 7:57AM CDT until September 3 at 9:30AM CDT by NWS Bismarck ND
An estimated 49,450 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 17, 2026 · score 34 · 16.9 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 40 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 | High |
| Calamity Score (ours) | 40 / 100 |
| Our confidence | 91% |
| Coordinates | 48.1468, -101.0112 |
| Nearest City | Minot (23 km) |
| Population Exposed | 49.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T12:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.c42e273284d48977c08bb58c6daf1e42146aafba.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | McHenry, ND; Ward, ND; McHenry, ND |
| Headline | Flash Flood Warning issued September 3 at 7:57AM CDT until September 3 at 9:30AM CDT by NWS Bismarck ND |
| Expires | 2026-09-03T09:30:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c42e273284d48977c08bb58c6daf1e42146aafba.001.1","noaa_urn:oid:2.49.0.1.840.0.fef1c97ef87a62c69624cf9d830f07d58d84a7ba.001.1"] |
| 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 | G |
| Iem Magnitude | 62 |
| Iem Unit | MPH |
| Iem City | 8 SSW Sawyer |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 Minot?
Calamity.live data shows a weather event with CalamityScore 40/100, near Minot (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.