This alert expired on 25 June 2026 at 02:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 131 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 7 May 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 24 at 7:47PM MDT until June 24 at 8:30PM MDT by NWS Denver CO
An estimated 1,076,373 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 25, 2026 · score 48 · 2.3 km
- June 29, 2026 · score 54 · 16.4 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 40.2800, -105.0617 |
| Nearest City | Longmont (13 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-25T01:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.93e96f5faeb9ddc930f4e0d5a2fac8a1e7a2f0b6.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Northeast Boulder, CO; Larimer, CO; Weld, CO |
| Headline | Severe Thunderstorm Warning issued June 24 at 7:47PM MDT until June 24 at 8:30PM MDT by NWS Denver CO |
| Expires | 2026-06-24T20:30:00-06:00 |
| SenderName | NWS Denver CO |
| HasExactCoords | true |
| Google News RssFeed | weather |
| Google News SourceName | Hindustan Times |
| MergedSources | [{"id":"gnews_weather_495095_234","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782344689000,"latitude":39.74,"longitude":-104.98},{"id":"gnews_weather_495095_244","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782342810000,"latitude":39.74,"longitude":-104.98},{"id":"gnews_weather_495094_254","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782341309000,"latitude":39.74,"longitude":-104.98}] |
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 Longmont?
Calamity.live data shows a weather event with CalamityScore 52/100, near Longmont (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.