This alert expired on 13 August 2026 at 21:45 UTC. It is kept here as a record.
It is the 7th strongest of the 13 detections recorded within 20 km of this point since 18 July 2026. The last comparable one was on 22 July 2026.
What the source measured
NOAA reported: Flash Flood Warning issued August 13 at 12:50PM MDT until August 13 at 3:45PM MDT by NWS Grand Junction CO
Nearby, since 18 July 2026
- August 31, 2026 · score 39 · 15.9 km
- August 30, 2026 · score 39 · 15.9 km
- July 18, 2026 · score 39 · 18.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 58 % 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) | 22 / 100 |
| Our confidence | 58% |
| Coordinates | 38.6514, -109.0043 |
| Nearest City | Grand Junction (60 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-13T18:50:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.76144c187adb2c42c065e54f31d3dafaf89eb7b1.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mesa, CO |
| Headline | Flash Flood Warning issued August 13 at 12:50PM MDT until August 13 at 3:45PM MDT by NWS Grand Junction CO |
| Expires | 2026-08-13T15:45:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.