This alert expired on 1 June 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 36 recorded within 20 km of this point since 5 May 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 1 at 5:03PM MDT until June 1 at 5:15PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- August 29, 2026 · score 22 · 8.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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 | critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 60% |
| Coordinates | 41.9100, -103.2920 |
| Nearest City | Cheyenne (153 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-01T23:03:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Box Butte, NE; Morrill, NE; Scotts Bluff, NE; Sioux, NE |
| Headline | Tornado Warning issued June 1 at 5:03PM MDT until June 1 at 5:15PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-01T17:15:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
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 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 46/100, near Cheyenne (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.