Right now
The most recent data we hold from NOAA arrived 9 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 17 September 2026 at 02:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued September 16 at 3:32PM MST until September 16 at 7:30PM MST by NWS Flagstaff AZ
Urban PEI: 70,320 within a heuristic 50 km radius; not unique people.
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 | 35.0825, -111.1433 |
| Nearest City | Flagstaff (48 km) |
| Urban exposure index (PEI) | 70.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-16T22:32:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.177345da765d11e3d830174bf92a914846558fb0.001.1 |
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: 2026-09-16T22:32:00.000Z.
First archived: 2026-09-16T22:37:14.050Z. 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 | Yavapai, AZ; Coconino, AZ; Coconino, AZ; Yavapai, AZ and 12 more areas |
| Headline | Flash Flood Warning issued September 16 at 3:32PM MST until September 16 at 7:30PM MST by NWS Flagstaff AZ |
| Expires | 2026-09-16T19:30:00-07:00 |
| SenderName | NWS Flagstaff AZ |
| HasExactCoords | true |
| MergedCount | 29 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.177345da765d11e3d830174bf92a914846558fb0.001.1","noaa_urn:oid:2.49.0.1.840.0.0ddf8ef1e52a7a5b8723131b747b22890af08ab8.001.1","noaa_urn:oid:2.49.0.1.840.0.b0617e5dff14e194ac7ee360395442a6853b5566.001.1","noaa_urn:oid:2.49.0.1.840.0.ff388913006048199165bb536fb82be0ec5bd408.001.1","noaa_urn:oid:2.49.0.1.840.0.5846e4521c191380dd73cf8c32aaca2e9e32e469.001.1","noaa_urn:oid:2.49.0.1.840.0.e5eb0e9513a8ff4eb4d4353c3fa85eafb7599c44.001.1","noaa_urn:oid:2.49.0.1.840.0.1489f9072be3941bf03748323f1e957fbf3d1d65.001.1","noaa_urn:oid:2.49.0.1.840.0.453f71b188b7418ae3530123767f3a97680b5268.001.1","noaa_urn:oid:2.49.0.1.840.0.d5c67af468480d00397181bf7d9708018ac309c6.001.1","noaa_urn:oid:2.49.0.1.840.0.b5fc327a317dc2dee2b7013adaf48b88fff725af.001.1","noaa_urn:oid:2.49.0.1.840.0.84816bcbdc75009de6f9a008f2eeebe9c524b6de.001.1","noaa_urn:oid:2.49.0.1.840.0.c8e98b1ddf582c11023b4ba5d0985119640c55fb.001.1","noaa_urn:oid:2.49.0.1.840.0.ed68d2d404b7c035fda1f821a08cf7f3e7a69e2d.001.1","noaa_urn:oid:2.49.0.1.840.0.68a6f5955dc14fbdb04c1aa53912dafd2e5387f4.001.1","noaa_urn:oid:2.49.0.1.840.0.ddd5311b597df77477c99be4a07214944400a4d3.001.1","noaa_urn:oid:2.49.0.1.840.0.24eb9f286f2683f3c6abce5debbdea5961efec01.001.1","noaa_urn:oid:2.49.0.1.840.0.5ac798a2f4eafc41bbb191de4151fe223be3f0f7.001.1","noaa_urn:oid:2.49.0.1.840.0.c18cb7075eb849637cfb506a243a4e5713a95ecf.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:2.49.0.1.840.0.4f22bc22d2e77de2b85ea15b149dd498e05a63a9.001.1","noaa_urn:oid:2.49.0.1.840.0.b3e7265e754f82eba710539427bb69853d25b1c4.001.1","noaa_urn:oid:2.49.0.1.840.0.93ca183f479f96b447c2ff3c83b3fe44e21de5cd.001.1","noaa_urn:oid:2.49.0.1.840.0.3949bca3cbf0ce5d52fb0dc364701b5b5b17d5fe.001.1","noaa_urn:oid:2.49.0.1.840.0.57b9c6a912bb72027920ed762cfe80ccc19fa39d.001.1","noaa_urn:oid:2.49.0.1.840.0.3b3ff4df94374f8558db09f615a85ee4e08284a6.001.1","noaa_urn:oid:2.49.0.1.840.0.edddcd92cf330e978e065e0d840128abcf748d90.001.1","noaa_urn:oid:2.49.0.1.840.0.d6ad8278538ad8695181e16f56f8fc6da351df4b.001.1","noaa_urn:oid:2.49.0.1.840.0.94931bc43858fe62619fd165d51b00d5b9e32664.001.1"] |
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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