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 7 September 2026 at 04:01 UTC. It is kept here as a record.
It is the 11th strongest of the 22 detections recorded within 20 km of this point since 5 May 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 6 at 9:51PM MDT until September 6 at 10:00PM MDT by NWS Cheyenne WY
Nearby, since 5 May 2026
- June 21, 2026 · score 22 · 13.0 km
- August 29, 2026 · score 28 · 18.6 km
- July 24, 2026 · score 22 · 20.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 66% |
| Coordinates | 42.5540, -104.8480 |
| Nearest City | Casper (125 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-07T03:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.319325bdad8db95838881e4fc9763cc5aacfb395.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Converse, WY; Niobrara, WY; Platte, WY |
| Headline | Severe Thunderstorm Warning issued September 6 at 9:51PM MDT until September 6 at 10:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-09-06T22:01:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 73 |
| Spc Location | 8 S Sibley Peak |
| Spc County | Platte |
| Spc State | WY |
| Spc Comments | Mesonet station WY1 8.4 S Sibley Peak (WYDOT). (CYS) |
| MergedSources | [{"id":"spc_wind_42.32_-105.05_163","source":"spc","severity":"medium","severityValue":45,"timestamp":1788751080000,"latitude":42.32,"longitude":-105.05}] |
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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