This alert expired on 30 August 2026 at 11:19 UTC. It is kept here as a record.
No stronger detection stands among the 18 recorded within 20 km of this point since 15 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 6:09AM CDT until August 30 at 6:15AM CDT by NWS Bismarck ND
An estimated 26,977 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 6, 2026 · score 34 · 6.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 82% |
| Coordinates | 47.9538, -103.1112 |
| Nearest City | Williston (44 km) |
| Population Exposed | 27.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T11:09:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McKenzie, ND |
| Headline | Severe Thunderstorm Warning issued August 30 at 6:09AM CDT until August 30 at 6:15AM CDT by NWS Bismarck ND |
| Expires | 2026-08-30T06:19:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 34/100, near Williston (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.