Right now
The most recent data we hold from NOAA arrived 7 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 30 May 2026 at 21:18 UTC. It is kept here as a record.
It is the 9th strongest of the 17 detections recorded within 20 km of this point since 3 May 2026. The last comparable one was on 5 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 30 at 3:08PM MDT until May 30 at 3:15PM MDT by NWS Cheyenne WY
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 60 % 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) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 42.7950, -103.5900 |
| Nearest City | Rapid City (146 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-30T21:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.202d55a0eae5d4518d0e9f3d958bfb88 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Niobrara, WY; Dawes, NE |
| Headline | Severe Thunderstorm Warning issued May 30 at 3:08PM MDT until May 30 at 3:15PM MDT by NWS Cheyenne WY |
| Expires | 2026-05-30T15:18:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.202d55a0eae5d4518d0e9f3d958bfb88f4542170.001.1","noaa_urn:oid:2.49.0.1.840.0.c8b6ef9d4f71fb934912ce9d5a066369abd12774.001.1"] |
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.
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