Right now
The most recent data we hold from NOAA arrived 68 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 1 June 2026 at 22:00 UTC. It is kept here as a record.
It is the 4th strongest of the 23 detections recorded within 20 km of this point since 28 April 2026. 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 3:28PM MDT until June 1 at 4:00PM MDT by NWS Denver CO
An estimated 65,132 people live within 50 km of this point.
Nearby, since 28 April 2026
- July 30, 2026 · score 39 · 16.0 km
- July 29, 2026 · score 39 · 16.0 km
- June 26, 2026 · score 43 · 19.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 40.8765, -104.4836 |
| Nearest City | Cheyenne (41 km) |
| Population Exposed | 65.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T21:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f5b895216091b3c0c8f317a7d005e9db |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Larimer, CO; Weld, CO; Adams, CO; Washington, CO; Adams, CO; Central Arapahoe, CO and 2 more areas |
| Headline | Severe Thunderstorm Warning issued June 1 at 3:28PM MDT until June 1 at 4:00PM MDT by NWS Denver CO |
| Expires | 2026-06-01T16:00:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f5b895216091b3c0c8f317a7d005e9dbf25e8e59.001.1","noaa_urn:oid:2.49.0.1.840.0.36a6410adcbad6b5a935e7565f5dce343befa3d0.002.1","noaa_urn:oid:2.49.0.1.840.0.c40911bf1f065b3a53eae08f02cad5ea966aff96.001.1","noaa_urn:oid:2.49.0.1.840.0.dfc68e0ce47f8b3bffcd0a0918f754bca44931dc.001.1","noaa_urn:oid:2.49.0.1.840.0.b2be6ce9044377647db21af32f4b23831e2be68a.001.1","noaa_urn:oid:2.49.0.1.840.0.c153ba2785ecf54240231801a7e94e3cefe377ce.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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