This alert expired on 2 September 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 17 recorded within 20 km of this point since 3 April 2026 — 2 others scored the same. The last comparable one was on 30 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 4:36PM MDT until September 2 at 5:00PM MDT by NWS Great Falls MT
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 70 % 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 | 70% |
| Coordinates | 48.1692, -110.5349 |
| Nearest City | Great Falls (94 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T22:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.2a3dba9b234834073faaf7076147db360e0f429c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Blaine, MT; Chouteau, MT; Glacier, MT; Hill, MT; Liberty, MT; Pondera, MT; Toole, MT; Cascade, MT; Chouteau, MT; Fergus, MT; Hill, MT; Judith Basin, MT; Liberty, MT; Pondera, MT; Teton, MT; Toole, MT and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 2 at 4:36PM MDT until September 2 at 5:00PM MDT by NWS Great Falls MT |
| Expires | 2026-09-02T17:00:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2a3dba9b234834073faaf7076147db360e0f429c.001.1","noaa_urn:oid:2.49.0.1.840.0.3629fb9ea0ff3c5b6d9d86f81bef99c31de7259b.001.1","noaa_urn:oid:2.49.0.1.840.0.c84ec5acb3b0e7e3fd711d568398a4a0c9c6859e.001.1","noaa_urn:oid:2.49.0.1.840.0.7622f5dd500ad7f14ae5ebf30d2be302c0552636.002.1"] |
| 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) |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 11 NNE The Knees |
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.