Right now
The most recent data we hold from NOAA arrived 43 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 17 September 2026 at 01:23 UTC. It is kept here as a record.
It is the 6th strongest of the 9 detections recorded within 20 km of this point since 12 August 2026. The last comparable one was on 16 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 16 at 6:13PM MST until September 16 at 6:15PM MST by NWS Flagstaff AZ
Nearby, since 12 August 2026
- September 16, 2026 · score 28 · 15.2 km
- August 31, 2026 · score 32 · 18.1 km
- August 12, 2026 · score 39 · 21.9 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 | 35.0924, -112.6290 |
| Nearest City | Prescott Valley (61 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-17T01:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8511205c6b2e39296f4c93e7a5f6a26550ffe9cc.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: 2026-09-17T01:13:00.000Z.
First archived: 2026-09-17T01:14:48.900Z. 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 | Coconino, AZ; Coconino, AZ; Yavapai, AZ; Yavapai, AZ and 4 more areas |
| Headline | Flash Flood Warning issued September 16 at 6:13PM MST until September 16 at 6:15PM MST by NWS Flagstaff AZ |
| Expires | 2026-09-16T18:23:00-07:00 |
| SenderName | NWS Flagstaff AZ |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8511205c6b2e39296f4c93e7a5f6a26550ffe9cc.001.1","noaa_urn:oid:2.49.0.1.840.0.ff80b4a46c534fce67cbd3bccc2270037fabdb42.001.1","noaa_urn:oid:2.49.0.1.840.0.51cdac2bdee06c7b0509874ba9c0a28dff846417.001.1","noaa_urn:oid:2.49.0.1.840.0.47b8fa0b29126703530355fdb8617dad35f48fda.001.1","noaa_urn:oid:2.49.0.1.840.0.f8910cbe309ce0c72b74c4bb5718f9dadb8b8738.001.1","noaa_urn:oid:2.49.0.1.840.0.e5eb0e9513a8ff4eb4d4353c3fa85eafb7599c44.001.1","noaa_urn:oid:2.49.0.1.840.0.8505e3ad5e1e6160caec413eda5e9512cc06d335.001.1","noaa_urn:oid:2.49.0.1.840.0.d0b2e591a7edb7fb72d563fb2edbb0d182d3d4e5.001.1"] |
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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