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 21 May 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 55 recorded within 20 km of this point since 6 May 2026 — 12 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 4:54PM MDT until May 21 at 5:30PM MDT by NWS Cheyenne WY
Nearby, since 6 May 2026
- May 21, 2026 · score 46 · 3.5 km
- July 8, 2026 · score 22 · 20.9 km
- June 3, 2026 · score 16 · 21.3 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 59 % 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 | 59% |
| Coordinates | 40.4375, -103.6308 |
| Nearest City | Evans (90 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-21T22:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.d35f97a1909b3c89994e9c5f85fe970e |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Kimball, NE; Lincoln, CO; Washington, CO |
| Headline | Tornado Warning issued May 21 at 4:54PM 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 |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d35f97a1909b3c89994e9c5f85fe970eaa917159.001.1","noaa_urn:oid:2.49.0.1.840.0.ffd3e3349c3fb0fd00a0a9c88a13d1ea5b7bf061.001.1"] |
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.
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