This alert expired on 13 July 2026 at 00:30 UTC. It is kept here as a record.
It is the 11th strongest of the 69 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 13 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 12 at 5:32PM MDT until July 12 at 6:30PM MDT by NWS Great Falls MT
An estimated 59,638 people live within 50 km of this point.
Nearby, since 8 March 2026
- August 28, 2026 · score 39 · 10.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 80 % 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) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 47.5310, -110.9330 |
| Nearest City | Great Falls (28 km) |
| Population Exposed | 59.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-12T23:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.43c11e6587fa4abcd503cd73a74ff2b3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cascade, MT; Chouteau, MT; Judith Basin, MT; Cascade, MT; Chouteau, MT; Teton, MT |
| Headline | Severe Thunderstorm Warning issued July 12 at 5:32PM MDT until July 12 at 6:30PM MDT by NWS Great Falls MT |
| Expires | 2026-07-12T18:30:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.43c11e6587fa4abcd503cd73a74ff2b3006a077a.001.1","noaa_urn:oid:2.49.0.1.840.0.e947d18eb0daea052d7a0b4eb71abcff37588eb6.001.1"] |
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 near Great Falls?
Calamity.live data shows a weather event with CalamityScore 39/100, near Great Falls (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.