This alert expired on 21 July 2026 at 01:30 UTC. It is kept here as a record.
It is the 12th strongest of the 35 detections recorded within 20 km of this point since 28 April 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 20 at 7:06PM MDT until July 20 at 7:30PM MDT by NWS Cheyenne WY
Nearby, since 28 April 2026
- July 24, 2026 · score 22 · 21.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 42.2467, -104.1417 |
| Nearest City | Cheyenne (135 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-21T01:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6104ec5a74296d878cb3bbce945b301a4399187d.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Sioux, NE; Goshen, WY |
| Headline | Severe Thunderstorm Warning issued July 20 at 7:06PM MDT until July 20 at 7:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-07-20T19:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
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 10 February 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.
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 188 scientific monitoring sources.