This alert expired on 1 June 2026 at 22:30 UTC. It is kept here as a record.
No stronger detection stands among the 25 recorded within 20 km of this point since 15 March 2026 — 11 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 1 at 3:56PM MDT until June 1 at 4:30PM MDT by NWS Cheyenne WY
An estimated 130,178 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 2, 2026 · score 43 · 2.3 km
- June 26, 2026 · score 43 · 12.3 km
- June 3, 2026 · score 16 · 19.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 80 % 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 40.5413, -104.2373 |
| Nearest City | Greeley (42 km) |
| Population Exposed | 130.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T21:56:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7bdfede02feceaae381fff0189d96d29 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Laramie, WY; Adams, CO; Morgan, CO; Washington, CO; Adams, CO; Washington, CO and 5 more areas |
| Headline | Severe Thunderstorm Warning issued June 1 at 3:56PM MDT until June 1 at 4:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-01T16:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7bdfede02feceaae381fff0189d96d29f25cc020.001.1","noaa_urn:oid:2.49.0.1.840.0.47b66c3d23878346d76a8738152a9c22024a0478.001.1","noaa_urn:oid:2.49.0.1.840.0.031b05fb79bf20e0866d28a4a700caad92385515.001.1","noaa_urn:oid:2.49.0.1.840.0.1a21c2da2254402f6ed060fe5a279b8f347713ac.001.1","noaa_urn:oid:2.49.0.1.840.0.987ad2a8adfd15cac7260005c5b1cecde0c574da.001.1","noaa_urn:oid:2.49.0.1.840.0.206bd35e5dcac3ff960df27b99ee8eecbf061311.001.1","noaa_urn:oid:2.49.0.1.840.0.4c3d81a775d581f65adac3223a93f9d7726e5d34.001.1","noaa_urn:oid:2.49.0.1.840.0.dc50f82632da8cf5dd003d79cba2540890939636.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.