Right now
The most recent data we hold from NOAA arrived 40 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 6 km from here.
This alert expired on 16 September 2026 at 23:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 18 detections recorded within 20 km of this point since 13 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 16 at 2:39PM MDT until September 16 at 5:45PM MDT by NWS Salt Lake City UT
Urban PEI: 70,320 within a heuristic 50 km radius; not unique people.
Nearby, since 13 July 2026
- September 12, 2026 · score 32 · 9.4 km
- August 5, 2026 · score 32 · 12.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 34.7522, -111.6225 |
| Nearest City | Flagstaff (50 km) |
| Urban exposure index (PEI) | 70.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-16T20:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.24eb9f286f2683f3c6abce5debbdea5961efec01.001.1 |
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: 2026-09-16T20:39:00.000Z.
First archived: 2026-09-16T20:42:16.126Z. 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 | Kane, UT; Coconino, AZ; San Juan, UT and 9 more areas |
| Headline | Flash Flood Warning issued September 16 at 2:39PM MDT until September 16 at 5:45PM MDT by NWS Salt Lake City UT |
| Expires | 2026-09-16T17:45:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| MergedCount | 21 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.24eb9f286f2683f3c6abce5debbdea5961efec01.001.1","noaa_urn:oid:2.49.0.1.840.0.ac367222188a9a1eb98dd9101faa5d89303e7e45.001.1","noaa_urn:oid:2.49.0.1.840.0.6d6c5db7e10cce58372bf26296fff36ac57e486d.001.1","noaa_urn:oid:2.49.0.1.840.0.d664bcc76492ce178bab77d55cc7d67231b9c35e.001.1","noaa_urn:oid:2.49.0.1.840.0.d2a162679a3c7805eeaa6c92e50a9a1ebbc8e027.001.1","noaa_urn:oid:2.49.0.1.840.0.8242c9002d9808e3f0dcb0a72fada94a48aae7af.001.1","noaa_urn:oid:2.49.0.1.840.0.d6bf82c929ca480a713817ba3cd33266d96d392d.001.1","noaa_urn:oid:2.49.0.1.840.0.414744841776099543b375c603b6daadb0bf4e69.001.1","noaa_urn:oid:2.49.0.1.840.0.6877174fd2c76a587039d561789f8b77e09f416e.001.1","noaa_urn:oid:2.49.0.1.840.0.c18cb7075eb849637cfb506a243a4e5713a95ecf.001.1","noaa_urn:oid:2.49.0.1.840.0.34b39539e3187ae0421a9bf4a1c302fcc6dbf23e.001.1","noaa_urn:oid:2.49.0.1.840.0.5d938ffdd8c5b0acb953c906f6dc168f12a97d64.001.1","noaa_urn:oid:2.49.0.1.840.0.d6bf9ba4754355cd5211cdb03d56457765ea7636.001.1","noaa_urn:oid:2.49.0.1.840.0.c53d4a567da793fd93593340370bc1f8abc8c97e.001.1","noaa_urn:oid:2.49.0.1.840.0.40f47c64079415325f8ad6bb4bb0c9ecaa8355fc.001.1","noaa_urn:oid:2.49.0.1.840.0.f25d086eabb4bbf2db069240fe26dd81325f55d2.001.1","noaa_urn:oid:2.49.0.1.840.0.94cc5ef3fddf415c2710da0a902411b16ddd11ed.001.1","noaa_urn:oid:2.49.0.1.840.0.1e668124be14148715b6876080f15902446048c9.001.1","noaa_urn:oid:2.49.0.1.840.0.08c59276e27045cc5787d862ea30eccef7653479.001.1","noaa_urn:oid:2.49.0.1.840.0.5ac798a2f4eafc41bbb191de4151fe223be3f0f7.001.1","noaa_urn:oid:2.49.0.1.840.0.69523f9a56a6d46c309db1122ae5e07892cdddf7.001.1"] |
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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