This alert expired on 21 July 2026 at 04:50 UTC. It is kept here as a record.
No stronger detection stands among the 7 recorded within 20 km of this point since 21 July 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 20 at 9:40PM PDT until July 20 at 9:45PM PDT by NWS Las Vegas NV
Nearby, since 21 July 2026
- August 10, 2026 · score 22 · 9.0 km
- August 9, 2026 · score 22 · 9.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 36.0000, -114.0171 |
| Nearest City | Boulder City (73 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-21T04:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.15c6cced004cc147f6e14d2e37348d331f080e5b.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mohave, AZ |
| Headline | Flash Flood Warning issued July 20 at 9:40PM PDT until July 20 at 9:45PM PDT by NWS Las Vegas NV |
| Expires | 2026-07-20T21:50:00-07:00 |
| SenderName | NWS Las Vegas NV |
| 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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100, near Boulder City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.