This alert expired on 2 September 2026 at 23:50 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 25 March 2026 — 24 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 5:40PM MDT until September 2 at 5:45PM MDT by NWS Great Falls MT
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 65 % 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 65% |
| Coordinates | 48.5886, -110.4571 |
| Nearest City | Great Falls (136 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T23:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7bdea79d2bcd148d20bd4295ba5beeb2f91e2eaa.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chouteau, MT; Glacier, MT; Hill, MT; Liberty, MT; Pondera, MT; Toole, MT |
| Headline | Severe Thunderstorm Warning issued September 2 at 5:40PM MDT until September 2 at 5:45PM MDT by NWS Great Falls MT |
| Expires | 2026-09-02T17:50:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 58 |
| Spc Location | 11 NNE The Knees |
| Spc County | Liberty |
| Spc State | MT |
| Spc Comments | Mesonet station GW3488 TIBER DAM TWELVE SOUTH. (TFX) |
| MergedSources | [{"id":"spc_wind_48.16_-111.17_132","source":"spc","severity":"medium","severityValue":45,"timestamp":1788387300000,"latitude":48.16,"longitude":-111.17}] |
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 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.