Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is in it.
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 03:00 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. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 15 at 7:09PM MDT until September 15 at 9:00PM MDT by NWS Salt Lake City UT
Nearby, since 29 July 2026
- July 29, 2026 · score 22 · 19.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.61/1 |
| Coordinates | 39.0117, -109.7367 |
| Nearest City | Grand Junction (103 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-16T01:09:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4e7c4aaf2612b1fd30ea8efec247a1af58f62bc0.001.1 |
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: 2026-09-16T01:09:00.000Z.
First archived: 2026-09-16T01:19:32.519Z. Material modification: 2026-09-16T02:03:05.466Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-16T02:03:05.466Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
2026-09-16T01:35:44.430Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Emery, UT; Mesa, CO; Grand, UT |
| Headline | Flash Flood Warning issued September 15 at 7:09PM MDT until September 15 at 9:00PM MDT by NWS Salt Lake City UT |
| Expires | 2026-09-15T21:00:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4e7c4aaf2612b1fd30ea8efec247a1af58f62bc0.001.1","noaa_urn:oid:2.49.0.1.840.0.91c16a794b99790d468ea61d98923cebb31c982f.001.1","noaa_urn:oid:2.49.0.1.840.0.2feca6d3836d4501e82f40b103aa7c72304dc97a.001.1","noaa_urn:oid:2.49.0.1.840.0.33de8ece8c4f1dc4b381179cf2b7f2aa51aa15e2.001.1"] |
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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