This alert expired on 30 August 2026 at 20:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 192 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 2:10PM MDT until August 30 at 2:45PM MDT by NWS Denver CO
An estimated 2,334,046 people live within 50 km of this point.
Nearby, since 12 March 2026
- August 30, 2026 · score 52 · 12.6 km
- August 30, 2026 · score 52 · 13.5 km
- May 5, 2026 · score 52 · 13.5 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 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) | 52 / 100 |
| Our confidence | 81% |
| Coordinates | 39.8931, -105.3548 |
| Nearest City | Boulder (15 km) |
| Population Exposed | 2.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T20:10:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Southwest Boulder, CO; Southeast Boulder, CO; Broomfield, CO; Clear Creek, CO; Gilpin, CO; Jefferson, CO; Southwest Boulder, CO; Southeast Boulder, CO; Gilpin, CO; Jefferson, CO |
| Headline | Severe Thunderstorm Warning issued August 30 at 2:10PM MDT until August 30 at 2:45PM MDT by NWS Denver CO |
| Expires | 2026-08-30T14:45:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4ebd5817efd00f0a5253abfe8f86e72cddd48d04.001.1","noaa_urn:oid:2.49.0.1.840.0.7863f9071113e1c69bb5830793740dd912bf767b.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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Boulder (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.