Right now
The most recent data we hold from NOAA arrived 24 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
6 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 16 September 2026 at 02:46 UTC. It is kept here as a record.
It is the 3rd strongest of the 9 detections recorded within 20 km of this point since 29 July 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 15 at 8:36PM MDT until September 15 at 8:45PM MDT by NWS Grand Junction CO
Nearby, since 29 July 2026
- July 29, 2026 · score 22 · 19.7 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 | 39.0117, -109.7367 |
| Nearest City | Grand Junction (103 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-16T02:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.5b841b4867f70edc4b53827bfac584cf8fdd4b21.001.1 |
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: 2026-09-16T02:36:00.000Z.
First archived: 2026-09-16T02:40:45.817Z. 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 | Grand, UT; Emery, UT; Mesa, CO |
| Headline | Flash Flood Warning issued September 15 at 8:36PM MDT until September 15 at 8:45PM MDT by NWS Grand Junction CO |
| Expires | 2026-09-15T20:46:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5b841b4867f70edc4b53827bfac584cf8fdd4b21.001.1","noaa_urn:oid:2.49.0.1.840.0.1faa03d4a4dac6ae9f6b4eb4d00f3372bfa65cc2.001.1","noaa_urn:oid:2.49.0.1.840.0.4e7c4aaf2612b1fd30ea8efec247a1af58f62bc0.001.1","noaa_urn:oid:2.49.0.1.840.0.91c16a794b99790d468ea61d98923cebb31c982f.001.1"] |
| Iem TypeSummary | F |
| Iem City | 12 SE Elgin |
| Iem County | Grand |
| Iem State | UT |
| Iem Wfo | GJT |
| Iem Remark | Search and rescue responding to a vehicle in a flooded wash. |
| MergedSources | [{"id":"iem_F_38.890_-109.950_1789525140000","source":"iem","severity":"low","severityValue":25,"timestamp":1789525140000,"latitude":38.89,"longitude":-109.95}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens in this area?