Right now
The most recent data we hold from NOAA arrived 8 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 13 May 2026 at 23:00 UTC. It is kept here as a record.
It is one of only 4 we have recorded within 20 km of this point since 13 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 3:58PM MDT until May 13 at 5:00PM MDT by NWS Billings MT
Nearby, since 13 May 2026
- July 16, 2026 · score 22 · 6.5 km
- June 12, 2026 · score 22 · 19.5 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 60 % 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 | 60% |
| Coordinates | 46.8386, -110.0288 |
| Nearest City | Great Falls (121 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-13T21:58:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.eb4bdb63259df0e8f5b334fbc9b84d74 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Park, MT; Stillwater, MT; Sweet Grass, MT; Blaine, MT; Chouteau, MT; Fergus, MT; Hill, MT; Judith Basin, MT; Liberty, MT |
| Headline | Severe Thunderstorm Warning issued May 13 at 3:58PM MDT until May 13 at 5:00PM MDT by NWS Billings MT |
| Expires | 2026-05-13T17:00:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eb4bdb63259df0e8f5b334fbc9b84d74fd938db5.001.1","noaa_urn:oid:2.49.0.1.840.0.496beb509a0c678e9618fd787755afb5075f4cc8.002.1"] |
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.