This alert expired on 12 August 2026 at 20:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 127 detections recorded within 20 km of this point since 14 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 2:29PM MDT until August 12 at 2:45PM MDT by NWS Cheyenne WY
An estimated 65,132 people live within 50 km of this point.
Nearby, since 14 March 2026
- July 9, 2026 · score 39 · 1.7 km
- July 30, 2026 · score 39 · 6.8 km
- July 29, 2026 · score 39 · 6.8 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 90% |
| Coordinates | 41.0600, -104.5620 |
| Nearest City | Cheyenne (23 km) |
| Population Exposed | 65.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T20:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.09cdc99d0f417677b9a0bd08db1bb043b0ba46a1.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Laramie, WY |
| Headline | Severe Thunderstorm Warning issued August 12 at 2:29PM MDT until August 12 at 2:45PM MDT by NWS Cheyenne WY |
| Expires | 2026-08-12T14:45:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 0.5 |
| Iem Unit | Inch |
| Iem City | 2 SW South Greeley High |
| Iem County | Laramie |
| Iem State | WY |
| Iem Wfo | CYS |
| MergedSources | [{"id":"iem_H_41.150_-104.810_1786564680000","source":"iem","severity":"low","severityValue":25,"timestamp":1786564680000,"latitude":41.15,"longitude":-104.81},{"id":"iem_G_41.030_-104.730_1786565400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786565400000,"latitude":41.03,"longitude":-104.73},{"id":"iem_H_41.080_-104.830_1786564740000","source":"iem","severity":"low","severityValue":25,"timestamp":1786564740000,"latitude":41.08,"longitude":-104.83}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 39/100, near Cheyenne (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.