Severe Weather in United States
Right now
The most recent data we hold from NOAA arrived 22 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 4 km from here.
This alert expired on 13 September 2026 at 20:37 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 20 August 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 13 at 1:27PM MST until September 13 at 1:30PM MST by NWS Flagstaff AZ
Nearby, since 12 August 2026
- August 12, 2026 · score 39 · 19.3 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 v4. 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 | 35.1537, -112.4423 |
| Nearest City | Prescott Valley (61 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-13T20:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.c4a6bf086172b14283e1acd5c7c45750718ccc63.001.1 |
Physical priority index · v4 (historical). 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: 2026-09-13T20:27:00.000Z.
First archived: 2026-09-13T20:28:43.395Z. 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; Yavapai, AZ |
| Headline | Flash Flood Warning issued September 13 at 1:27PM MST until September 13 at 1:30PM MST by NWS Flagstaff AZ |
| Expires | 2026-09-13T13:37:00-07:00 |
| SenderName | NWS Flagstaff AZ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c4a6bf086172b14283e1acd5c7c45750718ccc63.001.1","noaa_urn:oid:2.49.0.1.840.0.ef08b637b9d5e5dedd898b68469cb9f97ad39065.001.1","noaa_urn:oid:2.49.0.1.840.0.2a0986dd3b647d901c0addae1a2beb8fe1363ea3.001.1"] |
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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