Right now
The most recent data we hold from NOAA arrived 7 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 14 May 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 7 April 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 5:22PM MDT until May 13 at 6:00PM MDT by NWS Great Falls MT
Nearby, since 7 April 2026
- September 8, 2026 · score 16 · 20.5 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 | 47.1630, -108.5107 |
| Nearest City | Billings (154 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-13T23:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.955ca85971c8e62f91721f56951b3c42 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fergus, MT; Golden Valley, MT; Wheatland, MT; Big Horn, MT; Rosebud, MT and 2 more areas |
| Headline | Severe Thunderstorm Warning issued May 13 at 5:22PM MDT until May 13 at 6:00PM MDT by NWS Great Falls MT |
| Expires | 2026-05-13T18:00:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.955ca85971c8e62f91721f56951b3c42bca9a54a.001.1","noaa_urn:oid:2.49.0.1.840.0.22e0d7ed503ec835d349e27c2d4fda580e108baf.001.1","noaa_urn:oid:2.49.0.1.840.0.d2b7597b7de988226030c739dbed9b9bf2cb9f2d.001.1","noaa_urn:oid:2.49.0.1.840.0.510d9b00ee09bb63cc0318dee76e3194ba79a9c4.001.1","noaa_urn:oid:2.49.0.1.840.0.41f6f160ba922c7ad60abfdd10e6dcc6feb82825.002.1"] |
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.
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