This alert is in force until 3 September 2026, 17:15 UTC.
It is the 2nd strongest of the 8 detections recorded within 20 km of this point since 30 June 2026. The last comparable one was on 24 August 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 3 at 9:13AM CDT until September 3 at 12:15PM CDT by NWS Bismarck ND
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 72 % 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) | 28 / 100 |
| Our confidence | 72% |
| Coordinates | 48.4475, -99.9900 |
| Nearest City | Minot (100 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T14:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.2502aeb0cc96232815381294eaed6caa85963f19.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bottineau, ND; McHenry, ND; Pierce, ND; Rolette, ND |
| Headline | Flash Flood Warning issued September 3 at 9:13AM CDT until September 3 at 12:15PM CDT by NWS Bismarck ND |
| Expires | 2026-09-03T12:15:00-05:00 |
| 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 | R |
| Iem Magnitude | 2 |
| Iem Unit | Inch |
| Iem City | Denbigh |
| Iem County | McHenry |
| Iem State | ND |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.