Right now
The most recent data we hold from NOAA arrived 45 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 July 2026 at 08:46 UTC. It is kept here as a record.
It is the 11th strongest of the 16 detections recorded within 20 km of this point since 16 June 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 17 at 1:36AM MST until July 17 at 1:45AM MST by NWS Phoenix AZ
Urban PEI: 39,244 within a heuristic 50 km radius; not unique people.
Nearby, since 16 June 2026
- July 26, 2026 · score 43 · 6.8 km
- June 16, 2026 · score 34 · 10.6 km
- July 17, 2026 · score 39 · 12.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Legacy data-support index | 0.82/1 |
| Coordinates | 33.9099, -111.6003 |
| Nearest City | Fountain Hills (35 km) |
| Urban exposure index (PEI) | 39.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-17T08:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.83474c390b91fae788e79f82d1f6fd08 |
Physical priority index · v1. 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: 2026-07-17T08:36:00.000Z.
First archived: 2026-07-17T08:40:55.619Z. 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 | Gila, AZ; Maricopa, AZ; Maricopa, AZ; Gila, AZ |
| Headline | Flash Flood Warning issued July 17 at 1:36AM MST until July 17 at 1:45AM MST by NWS Phoenix AZ |
| Expires | 2026-07-17T01:46:00-07:00 |
| SenderName | NWS Phoenix AZ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.83474c390b91fae788e79f82d1f6fd08475c49cd.001.1","noaa_urn:oid:2.49.0.1.840.0.7d28dce35ff0e3eb62bddfc26d5e00973f88c944.001.1","noaa_urn:oid:2.49.0.1.840.0.ac69518eaa971a61a5aeea576a09f3b4f16b7101.001.1"] |
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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