Right now
The most recent data we hold from NOAA arrived 15 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
9 other detections within 20 km in the last 24 hours, the nearest 6 km from here.
This alert expired on 5 September 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 48 recorded within 20 km of this point since 5 May 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 5 at 4:22PM MDT until September 5 at 5:00PM MDT by NWS Cheyenne WY
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 71% |
| Coordinates | 42.0825, -102.8513 |
| Nearest City | Cheyenne (194 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-05T22:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.53b3d93bb3ee1149dc5849c99667cb21b4c3377f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Box Butte, NE; Morrill, NE |
| Headline | Severe Thunderstorm Warning issued September 5 at 4:22PM MDT until September 5 at 5:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-09-05T17:00:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 250 |
| Spc Location | 5 WNW Alliance |
| Spc County | Box Butte |
| Spc State | NE |
| Spc Comments | Trained Weather Spotter has reported 2.5 inch hail 5 miles WNW of Alliance. (CYS) |
| Iem TypeSummary | H |
| Iem Magnitude | 2.5 |
| Iem Unit | Inch |
| Iem City | 5 WNW Alliance |
| Iem County | Box Butte |
| Iem State | NE |
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?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.