This alert expired on 12 August 2026 at 06:00 UTC. It is kept here as a record.
It is the 14th strongest of the 73 detections recorded within 20 km of this point since 2 June 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 11 at 6:49PM CDT until August 12 at 1:00AM CDT by NWS Bismarck ND
Nearby, since 2 June 2026
- July 17, 2026 · score 16 · 0.0 km
- July 16, 2026 · score 22 · 0.0 km
- July 9, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % 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) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 47.5000, -100.5000 |
| Nearest City | Bismarck (80 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-11T23:49:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Adams, ND; Billings, ND; Bowman, ND; Dickey, ND; Emmons, ND; Golden Valley, ND; Grant, ND; Hettinger, ND; LaMoure, ND; Logan, ND; McIntosh, ND; Sioux, ND; Slope, ND; Stark, ND; Stutsman, ND; Barnes, ND; Ransom, ND; Sargent, ND |
| Headline | Severe Thunderstorm Watch issued August 11 at 6:49PM CDT until August 12 at 1:00AM CDT by NWS Bismarck ND |
| Expires | 2026-08-12T01:00:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bed6ff1373189884f279a05df11d3f80cb8146b0.001.1","noaa_urn:oid:2.49.0.1.840.0.cb2a50e4b739642cef302cef253eb9ba228e2c17.001.1"] |
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 22/100, near Bismarck (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.