Right now
The most recent data we hold from NOAA arrived 3 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 12 September 2026 at 22:20 UTC. It is kept here as a record.
No stronger detection stands among the 17 recorded within 20 km of this point since 12 May 2026 — 16 others scored the same. Another comparable one was recorded here earlier the same day. 23 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 12 at 3:10PM MST until September 12 at 3:15PM MST by NWS Tucson AZ
Urban PEI: 855,005 within a heuristic 50 km radius; not unique people.
Nearby, since 12 May 2026
- July 17, 2026 · 3.0 km
- August 30, 2026 · 3.4 km
- June 18, 2026 · 3.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 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) | 41 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 32.1480, -110.9345 |
| Nearest City | Tucson (8 km) |
| Urban exposure index (PEI) | 855.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-12T22:10:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e3ec3b0e0ee6367d4e9984ccd4161efef334c75f.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: 2026-09-12T22:10:00.000Z.
First archived: 2026-09-12T22:15:49.912Z. 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 | Pima, AZ; Pima, AZ; Santa Cruz, AZ; Gila, AZ and 1 more areas |
| Headline | Flash Flood Warning issued September 12 at 3:10PM MST until September 12 at 3:15PM MST by NWS Tucson AZ |
| Expires | 2026-09-12T15:20:00-07:00 |
| SenderName | NWS Tucson AZ |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e3ec3b0e0ee6367d4e9984ccd4161efef334c75f.001.1","noaa_urn:oid:2.49.0.1.840.0.8817c5553adfc2ddb0f7daa073a04992e4df736f.001.1","noaa_urn:oid:2.49.0.1.840.0.dfa3cbaa905a5c0e6c8a6d07684569a8c0e27db2.001.1","noaa_urn:oid:2.49.0.1.840.0.6fbe7651ed2ae58553c566300c89ed776917dcc8.001.1","noaa_urn:oid:2.49.0.1.840.0.93f776657ea2dfec56beec41580bca9ad80dbb67.001.1","noaa_urn:oid:2.49.0.1.840.0.bebae28898b4e594a7e95da1e3711426a3b3d342.001.1","noaa_urn:oid:2.49.0.1.840.0.5c7abdfa133a7124f848162773f963654710d166.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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