This alert expired on 28 June 2026 at 01:00 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. Another comparable one was recorded here earlier the same day. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued June 27 at 5:46PM MDT until June 27 at 7:00PM 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 58 % 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 | 58% |
| Coordinates | 46.8000, -110.4000 |
| Nearest City | Great Falls (103 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-27T23:46:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.b3d44bc62aa7e9bbc01a857bfd6c59f1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Carter, MT; Custer, MT; Fallon, MT; Daniels, MT; Dawson, MT; Garfield, MT; McCone, MT; Prairie, MT; Richland, MT; Roosevelt, MT; Sheridan, MT; Valley, MT; Wibaux, MT |
| Headline | Severe Thunderstorm Watch issued June 27 at 5:46PM MDT until June 27 at 7:00PM MDT by NWS Billings MT |
| Expires | 2026-06-27T19:00:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b3d44bc62aa7e9bbc01a857bfd6c59f1c11a9488.002.1","noaa_urn:oid:2.49.0.1.840.0.9a20aef9346df3831e7fb1628aa93025e9f996ab.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 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.