Right now
The most recent data we hold from NOAA arrived 3 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 22 May 2026 at 00:00 UTC. It is kept here as a record.
It is the 9th strongest of the 56 detections recorded within 20 km of this point since 5 May 2026. 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: Severe Thunderstorm Warning issued May 21 at 5:22PM MDT until May 21 at 6:00PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 22, 2026 · score 46 · 12.2 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 41.2860, -103.3640 |
| Nearest City | Cheyenne (123 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-21T23:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.59ed498b871e770971429b62a1dcde0cda8b94ab.001.1 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-05-21T23:22:00.000Z.
First archived: 2026-05-21T23:24:16.303Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Banner, NE; Cheyenne, NE; Kimball, NE; Morrill, NE |
| Headline | Severe Thunderstorm Warning issued May 21 at 5:22PM MDT until May 21 at 6:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-05-21T18:00:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Iem TypeSummary | T |
| Iem City | 4 NNW Kimball |
| Iem County | Kimball |
| Iem State | NE |
| Iem Wfo | CYS |
| Iem Remark | NWS Employee reported a tornado due west of location. |
| 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},{"id":"iem_H_41.240_-103.830_1779403800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779403800000,"latitude":41.24,"longitude":-103.83},{"id":"iem_T_41.280_-103.680_1779403860000","source":"iem","severity":"low","severityValue":25,"timestamp":1779403860000,"latitude":41.28,"longitude":-103.68}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?