This alert expired on 21 May 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 73 recorded within 20 km of this point since 5 May 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 21 at 4:44PM MDT until May 21 at 5:30PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 22, 2026 · score 46 · 18.3 km
- June 4, 2026 · score 16 · 19.6 km
- May 31, 2026 · score 28 · 22.6 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 69 % 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 | Critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 69% |
| Coordinates | 41.2900, -103.7240 |
| Nearest City | Cheyenne (93 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-21T22:44:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e2f3aa824ada591fc0dbe7a75742c5f35b4e670f.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Kimball, NE |
| Headline | Tornado Warning issued May 21 at 4:44PM MDT until May 21 at 5:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-05-21T17:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Iem TypeSummary | W |
| Iem City | 4 NNW Pine Bluffs |
| Iem County | Laramie |
| Iem State | WY |
| Iem Wfo | CYS |
| Iem Remark | CYS broadcast media shared a picture of a landspout kicking up dirt/dust. |
| MergedSources | [{"id":"iem_H_41.900_-103.680_1779400380000","source":"iem","severity":"low","severityValue":25,"timestamp":1779400380000,"latitude":41.9,"longitude":-103.68},{"id":"iem_W_41.180_-104.130_1779401040000","source":"iem","severity":"low","severityValue":25,"timestamp":1779401040000,"latitude":41.18,"longitude":-104.13},{"id":"iem_W_41.240_-104.070_1779402180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779402180000,"latitude":41.24,"longitude":-104.07},{"id":"iem_W_41.230_-104.080_1779401160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779401160000,"latitude":41.23,"longitude":-104.08}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.