This alert expired on 4 September 2026 at 00:30 UTC. It is kept here as a record.
It is the 24th strongest of the 42 detections recorded within 20 km of this point since 9 July 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 3 at 3:37PM MST until September 3 at 5:30PM MST by NWS Tucson AZ
Nearby, since 9 July 2026
- July 20, 2026 · score 22 · 7.8 km
- September 3, 2026 · score 16 · 12.6 km
- July 11, 2026 · score 22 · 14.0 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 61 % 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 | 61% |
| Coordinates | 32.2298, -109.9450 |
| Nearest City | Tanque Verde (75 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-03T22:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b6f2d2cd00930e27ad75179e6c5959e5a86a6d8c.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Graham, AZ; Pinal, AZ; Cochise, AZ; Graham, AZ |
| Headline | Flash Flood Warning issued September 3 at 3:37PM MST until September 3 at 5:30PM MST by NWS Tucson AZ |
| Expires | 2026-09-03T17:30:00-07:00 |
| SenderName | NWS Tucson AZ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b6f2d2cd00930e27ad75179e6c5959e5a86a6d8c.001.1","noaa_urn:oid:2.49.0.1.840.0.7d6eff6debd26785d185677b383278ffce38e950.001.1","noaa_urn:oid:2.49.0.1.840.0.de83176825a513867eb47ff736df96ecafbc7999.001.1","noaa_urn:oid:2.49.0.1.840.0.8d73993d85d3074a025370420f74ee754cea4ae7.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.