This alert expired on 18 June 2026 at 04:48 UTC. It is kept here as a record.
It is the 12th strongest of the 18 detections recorded within 20 km of this point since 18 June 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 17 at 9:38PM MST until June 17 at 9:45PM MST by NWS Tucson AZ
An estimated 325,387 people live within 50 km of this point.
Nearby, since 18 June 2026
- August 3, 2026 · score 43 · 3.4 km
- July 28, 2026 · score 39 · 16.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 37 / 100 |
| Our confidence | 79% |
| Coordinates | 31.5589, -111.3422 |
| Nearest City | Rio Rico (36 km) |
| Population Exposed | 325.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T04:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e52dbd2177185d9d972fe9be7d9948da5517c8b3.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Pima, AZ; Santa Cruz, AZ |
| Headline | Flash Flood Warning issued June 17 at 9:38PM MST until June 17 at 9:45PM MST by NWS Tucson AZ |
| Expires | 2026-06-17T21:48:00-07:00 |
| 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.