Right now
The most recent data we hold from NOAA arrived 2 hours 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 30 May 2026 at 01:05 UTC. It is kept here as a record.
It is the 6th strongest of the 45 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 29 at 6:55PM MDT until May 29 at 7:00PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 23, 2026 · score 46 · 1.0 km
- June 22, 2026 · score 46 · 22.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 67 % 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 | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 67% |
| Coordinates | 41.4799, -103.3716 |
| Nearest City | Cheyenne (127 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-30T00:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.fb1a1eae191f1cbdbb5b172862e8a115 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Banner, NE; Morrill, NE; Scotts Bluff, NE; Cheyenne, NE; Kimball, NE; Morrill, NE |
| Headline | Severe Thunderstorm Warning issued May 29 at 6:55PM MDT until May 29 at 7:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-05-29T19:05:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fb1a1eae191f1cbdbb5b172862e8a1152832ce14.001.1","noaa_urn:oid:2.49.0.1.840.0.511feb60257b09abf1ea90f84b392c0adecd64ed.001.1","noaa_urn:oid:2.49.0.1.840.0.06bf67372a1f89df98407a4825386f273d66cf72.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 9 NE Harrisburg |
| Iem County | Banner |
| Iem State | NE |
| Iem Wfo | CYS |
| Iem Remark | Storm Chaser reported a few quarter-sized hail stones around 6PM. |
| MergedSources | [{"id":"iem_H_41.430_-103.960_1780093920000","source":"iem","severity":"low","severityValue":25,"timestamp":1780093920000,"latitude":41.43,"longitude":-103.96},{"id":"iem_H_41.640_-103.630_1780099380000","source":"iem","severity":"low","severityValue":25,"timestamp":1780099380000,"latitude":41.64,"longitude":-103.63}] |
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.
Want to know when something happens in this area?