This alert expired on 4 August 2026 at 00:45 UTC. It is kept here as a record.
It is the 5th strongest of the 65 detections recorded within 20 km of this point since 13 April 2026. Another comparable one was recorded here earlier the same day. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 3 at 3:16PM MST until August 3 at 5:45PM MST by NWS Tucson AZ
An estimated 347,351 people live within 50 km of this point.
Nearby, since 13 April 2026
- August 27, 2026 · score 43 · 3.4 km
- July 28, 2026 · score 43 · 5.8 km
- August 29, 2026 · score 43 · 7.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 86 % 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 | 86% |
| Coordinates | 31.5718, -110.5455 |
| Nearest City | Sierra Vista (23 km) |
| Population Exposed | 347.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-03T22:16:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.4c1d2d55e2c243400570c4cd5e92e46c1edd63ac.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Santa Cruz, AZ |
| Headline | Flash Flood Warning issued August 3 at 3:16PM MST until August 3 at 5:45PM MST by NWS Tucson AZ |
| Expires | 2026-08-03T17:45:00-07:00 |
| SenderName | NWS Tucson AZ |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 66 |
| Iem Unit | MPH |
| Iem City | 6 NE Nogales |
| Iem County | Santa Cruz |
| Iem State | AZ |
| Iem Wfo | TWC |
| Iem Remark | ASOS station KOLS Nogales International Airport. |
| MergedSources | [{"id":"iem_G_31.420_-110.850_1785793500000","source":"iem","severity":"low","severityValue":25,"timestamp":1785793500000,"latitude":31.42,"longitude":-110.85}] |
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.