This alert expired on 1 June 2026 at 20:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 80 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 1 at 1:54PM MDT until June 1 at 2:15PM MDT by NWS Cheyenne WY
An estimated 2,615,321 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 22, 2026 · score 52 · 6.9 km
- June 26, 2026 · score 52 · 8.5 km
- July 22, 2026 · score 52 · 10.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 39.8943, -104.7315 |
| Nearest City | Brighton (13 km) |
| Population Exposed | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T19:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.d3dfa80aa3ccc0767b13503a6224f66f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Goshen, WY; Platte, WY; Northeast Boulder, CO; Weld, CO; Western Arapahoe, CO; Central Arapahoe, CO and 4 more areas |
| Headline | Severe Thunderstorm Warning issued June 1 at 1:54PM MDT until June 1 at 2:15PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-01T14:15:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d3dfa80aa3ccc0767b13503a6224f66f48a9c2b6.001.1","noaa_urn:oid:2.49.0.1.840.0.3ca627cae2cfdc27b134043b501ec587f22c0d30.001.1","noaa_urn:oid:2.49.0.1.840.0.cbf202881cd4cdf2047de670cf5038816e90e721.001.1","noaa_urn:oid:2.49.0.1.840.0.f72d33761b8795c8812975d0e34686e9d3d053ea.001.1","noaa_urn:oid:2.49.0.1.840.0.ead3b0f5a40fb9b6fdbb279fb46fc3761f0e8114.001.1","noaa_urn:oid:2.49.0.1.840.0.8143fef81135481d27ea39c044736b131f525cf0.001.1","noaa_urn:oid:2.49.0.1.840.0.4453fc17b7c089241364edfa79a9deb3f79fa231.001.1"] |
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 near Brighton?
Calamity.live data shows a weather event with CalamityScore 52/100, near Brighton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.