This alert expired on 31 August 2026 at 01:15 UTC. It is kept here as a record.
No stronger detection stands among the 23 recorded within 20 km of this point since 31 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 6:58PM MDT until August 30 at 7:15PM MDT by NWS Grand Junction CO
An estimated 19,062 people live within 50 km of this point.
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 86 % 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) | 34 / 100 |
| Our confidence | 86% |
| Coordinates | 38.8620, -107.9240 |
| Nearest City | Montrose (43 km) |
| Population Exposed | 19.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-31T00:58:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Delta, CO |
| Headline | Severe Thunderstorm Warning issued August 30 at 6:58PM MDT until August 30 at 7:15PM MDT by NWS Grand Junction CO |
| Expires | 2026-08-30T19:15:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| Iem TypeSummary | x |
| Iem City | 4 N Redstone |
| Iem County | Pitkin |
| Iem State | CO |
| Iem Wfo | GJT |
| Iem Remark | Mudslide on CO Highway 133 between Redstone Boulevard and Red Dog Road (Mile Point 55 to Mile Point 57). |
| MergedSources | [{"id":"iem_x_39.240_-107.230_1788120000000","source":"iem","severity":"low","severityValue":25,"timestamp":1788120000000,"latitude":39.24,"longitude":-107.23}] |
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 34/100, near Montrose (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.