This alert expired on 23 June 2026 at 02:00 UTC. It is kept here as a record.
No stronger detection stands among the 72 recorded within 20 km of this point since 17 March 2026 — 66 others scored the same. The last comparable one was on 8 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 22 at 12:36PM MDT until June 22 at 8:00PM MDT by NWS Billings MT
Nearby, since 17 March 2026
- August 30, 2026 · score 22 · 0.0 km
- July 26, 2026 · score 22 · 0.0 km
- July 25, 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 57 % 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 | 57% |
| Coordinates | 46.8000, -110.4000 |
| Nearest City | Great Falls (103 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-22T18:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.290d8a09dc701622caf68284c6f41efd2164ca9f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Big Horn, MT; Carter, MT; Custer, MT; Fallon, MT; Powder River, MT; Rosebud, MT; Sheridan, WY |
| Headline | Severe Thunderstorm Watch issued June 22 at 12:36PM MDT until June 22 at 8:00PM MDT by NWS Billings MT |
| Expires | 2026-06-22T20:00:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | false |
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.