Right now
The most recent data we hold from NOAA arrived 35 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 15 September 2026 at 02:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 37 detections recorded within 20 km of this point since 1 April 2026. The last comparable one was on 14 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 14 at 7:09PM MDT until September 14 at 8:15PM MDT by NWS Grand Junction CO
Nearby, since 1 April 2026
- September 14, 2026 · score 16 · 0.0 km
- July 28, 2026 · score 22 · 4.4 km
- June 11, 2026 · score 23 · 18.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 16 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.66/1 |
| Coordinates | 39.2638, -107.2163 |
| Nearest City | Montrose (104 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-15T01:09:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.ba15064c235a11a23b6a322324ba2113b981d105.001.1 |
Physical priority index · v5. 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: 2026-09-15T01:09:00.000Z.
First archived: 2026-09-15T01:19:19.047Z. 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 | Pitkin, CO |
| Headline | Flash Flood Warning issued September 14 at 7:09PM MDT until September 14 at 8:15PM MDT by NWS Grand Junction CO |
| Expires | 2026-09-14T20:15:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| Iem TypeSummary | x |
| Iem City | 1 SW Redstone |
| Iem County | Pitkin |
| Iem State | CO |
| Iem Wfo | GJT |
| Iem Remark | Highway 133 reduced to alternating traffic from MM 47-56 due to a mudslide. |
| MergedSources | [{"id":"iem_x_39.180_-107.240_1789422300000","source":"iem","severity":"low","severityValue":25,"timestamp":1789422300000,"latitude":39.18,"longitude":-107.24}] |
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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