This alert expired on 21 July 2026 at 05:15 UTC. It is kept here as a record.
It is the 7th strongest of the 39 detections recorded within 20 km of this point since 24 June 2026. The last comparable one was on 18 July 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 20 at 8:05PM MST until July 20 at 10:15PM MST by NWS Tucson AZ
An estimated 347,351 people live within 50 km of this point.
Nearby, since 24 June 2026
- July 18, 2026 · score 43 · 1.9 km
- August 6, 2026 · score 63 · 8.7 km
- July 28, 2026 · score 43 · 12.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 31.4400, -110.4871 |
| Nearest City | Sierra Vista (22 km) |
| Population Exposed | 347.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T03:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3ecda43c049193995f5454da85a25a9fc06ba697.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Cochise, AZ; Santa Cruz, AZ |
| Headline | Flash Flood Warning issued July 20 at 8:05PM MST until July 20 at 10:15PM MST by NWS Tucson AZ |
| Expires | 2026-07-20T22:15:00-07:00 |
| 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 near Sierra Vista?
Calamity.live data shows a weather event with CalamityScore 43/100, near Sierra Vista (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.