This alert expired on 3 September 2026 at 06:45 UTC. It is kept here as a record.
No stronger detection stands among the 41 recorded within 20 km of this point since 23 April 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 September 2 at 11:41PM MDT until September 3 at 12:45AM MDT by NWS Glasgow MT
Nearby, since 23 April 2026
- September 3, 2026 · score 28 · 0.7 km
- July 9, 2026 · score 22 · 15.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 73 % 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 | 73% |
| Coordinates | 48.0670, -105.2010 |
| Nearest City | Williston (118 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T05:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7c999c980d037380e777fe2774b43516dafd52f9.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dawson, MT; Garfield, MT; McCone, MT; Prairie, MT; Richland, MT; Roosevelt, MT; Daniels, MT; Roosevelt, MT; Sheridan, MT; Valley, MT |
| Headline | Severe Thunderstorm Warning issued September 2 at 11:41PM MDT until September 3 at 12:45AM MDT by NWS Glasgow MT |
| Expires | 2026-09-03T00:45:00-06:00 |
| SenderName | NWS Glasgow MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7c999c980d037380e777fe2774b43516dafd52f9.001.1","noaa_urn:oid:2.49.0.1.840.0.880a443be4a9f1f6638e8ec9f461805373eb223a.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 6 W Bredette |
| Spc County | Roosevelt |
| Spc State | MT |
| Spc Comments | Social media report of hail around quarter sized. Time estimated from radar. (GGW) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 6 W Bredette |
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 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.