This alert expired on 2 September 2026 at 21:33 UTC. It is kept here as a record.
It is the 6th strongest of the 9 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 3:24PM MDT until September 2 at 3:30PM MDT by NWS Great Falls MT
Nearby, since 3 April 2026
- September 2, 2026 · score 28 · 21.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 16 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 70% |
| Coordinates | 47.0725, -111.7151 |
| Nearest City | Great Falls (57 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-02T21:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b86589ab11d0c16ddc00ca54bcea122adacfc79d.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lewis and Clark, MT; Broadwater, MT; Jefferson, MT; Lewis and Clark, MT; Cascade, MT; Chouteau, MT; Hill, MT; Judith Basin, MT; Liberty, MT; Pondera, MT; Teton, MT; Toole, MT and 2 more areas |
| Headline | Severe Thunderstorm Warning issued September 2 at 3:24PM MDT until September 2 at 3:30PM MDT by NWS Great Falls MT |
| Expires | 2026-09-02T15:33:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b86589ab11d0c16ddc00ca54bcea122adacfc79d.001.1","noaa_urn:oid:2.49.0.1.840.0.1febd67ea077f7c35e2b3735780c5d423a86c0cd.001.1","noaa_urn:oid:2.49.0.1.840.0.2a34e90c0255f611a683c9493bd5bbf60daa9e37.001.1","noaa_urn:oid:2.49.0.1.840.0.952f79a3faf3e06f786a91bf88ab154ac0b1a9d2.001.1","noaa_urn:oid:2.49.0.1.840.0.3489120d9fd903e36400a6c838f421308f9de857.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 63 |
| Spc Location | 8 SSE Fort Shaw |
| Spc County | Cascade |
| Spc State | MT |
| Spc Comments | Mesonet station SURM8 Sun River Se. (TFX) |
| Iem TypeSummary | G |
| Iem Magnitude | 67 |
| Iem Unit | MPH |
| Iem City | 8 SSW Wolf Creek |
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.