This alert is in force until 31 August 2026, 03:00 UTC.
No stronger detection stands among the 70 recorded within 20 km of this point since 17 March 2026 — 66 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 30 at 1:37PM MDT until August 30 at 9:00PM MDT by NWS Glasgow MT
Nearby, since 17 March 2026
- July 26, 2026 · score 22 · 0.0 km
- July 25, 2026 · score 22 · 0.0 km
- July 19, 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 | 46.8000, -110.4000 |
| Nearest City | Great Falls (103 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T19:37:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Dawson, MT; McCone, MT; Prairie, MT; Richland, MT; Roosevelt, MT; Sheridan, MT; Wibaux, MT; Carter, MT; Custer, MT; Fallon, MT; Powder River, MT |
| Headline | Severe Thunderstorm Watch issued August 30 at 1:37PM MDT until August 30 at 9:00PM MDT by NWS Glasgow MT |
| Expires | 2026-08-30T21:00:00-06:00 |
| SenderName | NWS Glasgow MT |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e5f7f68df1504febd7cfea51882ed2047ce3390f.001.1","noaa_urn:oid:2.49.0.1.840.0.d6003a4b219d4c313d8cc866f19f83db8e516d38.001.1"] |
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 Great Falls (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.