This alert expired on 3 June 2026 at 22:15 UTC. It is kept here as a record.
It is the 19th strongest of the 137 detections recorded within 20 km of this point since 15 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 June 3 at 3:57PM MDT until June 3 at 4:15PM MDT by NWS Denver CO
An estimated 1,771,988 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 1, 2026 · score 52 · 3.2 km
- August 16, 2026 · score 52 · 7.2 km
- August 27, 2026 · score 58 · 13.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 81 % 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) | 46 / 100 |
| Our confidence | 81% |
| Coordinates | 39.3768, -104.7517 |
| Nearest City | Castle Rock (9 km) |
| Population Exposed | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-03T21:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.55325ed9a9851ea502f39d0019903ab4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Douglas, CO; Elbert, CO; Douglas, CO |
| Headline | Severe Thunderstorm Warning issued June 3 at 3:57PM MDT until June 3 at 4:15PM MDT by NWS Denver CO |
| Expires | 2026-06-03T16:15:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.55325ed9a9851ea502f39d0019903ab4770addf2.002.1","noaa_urn:oid:2.49.0.1.840.0.cc6fd4213cd4477bc93996e19cda157f5d1d53f8.001.1"] |
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 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.
Want to know when something happens near Castle Rock?
Calamity.live data shows a weather event with CalamityScore 46/100, near Castle Rock (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.