Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is in it.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert expired on 12 September 2026 at 04:30 UTC. It is kept here as a record.
It is the 9th strongest of the 11 detections recorded within 20 km of this point since 4 August 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 11 at 8:13PM MST until September 11 at 9:30PM MST by NWS Tucson AZ
Nearby, since 4 August 2026
- August 12, 2026 · score 22 · 4.5 km
- August 4, 2026 · score 46 · 4.5 km
- September 4, 2026 · score 16 · 18.3 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, at 62 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 62% |
| Coordinates | 31.7300, -111.9100 |
| Nearest City | Green Valley (88 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-12T03:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a2289f193c1c3713b0b691a6e4da9420128ece71.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Pima, AZ |
| Headline | Flash Flood Warning issued September 11 at 8:13PM MST until September 11 at 9:30PM MST by NWS Tucson AZ |
| Expires | 2026-09-11T21:30:00-07:00 |
| SenderName | NWS Tucson AZ |
| HasExactCoords | true |
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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