This alert expired on 13 August 2026 at 01:15 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 4 July 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 6:55PM MDT until August 12 at 7:15PM MDT by NWS Glasgow MT
Nearby, since 4 July 2026
- July 4, 2026 · score 22 · 22.4 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 59 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 46.8346, -105.5385 |
| Nearest City | Williston (205 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-13T00:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.34fe43228868803b50ba1af676efa93a917b9111.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dawson, MT; Prairie, MT |
| Headline | Severe Thunderstorm Warning issued August 12 at 6:55PM MDT until August 12 at 7:15PM MDT by NWS Glasgow MT |
| Expires | 2026-08-12T19:15:00-06:00 |
| SenderName | NWS Glasgow MT |
| 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 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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.