Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 19 July 2026 at 00:15 UTC. It is kept here as a record.
No stronger detection stands among the 25 recorded within 20 km of this point since 15 March 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 18 at 3:51PM MDT until July 18 at 6:15PM MDT by NWS Grand Junction CO
Urban PEI: 80,247 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- August 31, 2026 · score 39 · 3.1 km
- September 15, 2026 · score 32 · 3.4 km
- July 22, 2026 · score 39 · 16.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 39 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 38.8375, -108.2913 |
| Nearest City | Clifton (31 km) |
| Urban exposure index (PEI) | 80.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T21:51:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.0fbf9631b14f99a2556ab1dbb7fe6924 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-18T21:51:00.000Z.
First archived: 2026-07-18T21:56:04.885Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | San Miguel, CO; Mesa, CO; Garfield, CO; Rio Blanco, CO |
| Headline | Flash Flood Warning issued July 18 at 3:51PM MDT until July 18 at 6:15PM MDT by NWS Grand Junction CO |
| Expires | 2026-07-18T18:15:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0fbf9631b14f99a2556ab1dbb7fe692469810b6c.001.1","noaa_urn:oid:2.49.0.1.840.0.47ad9bc8d1631bfa384e50befa04997e65d57f32.001.1","noaa_urn:oid:2.49.0.1.840.0.dd8ffa78965cda374dc2e3af592b4119b32a3fe6.001.1"] |
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 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.
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