Excessive Heat — San Bernardino County-upper Colorado River Valley, California

2025-08-11 to 2025-08-13 · San Bernardino County-upper Colorado River Valley, California

Event narrative

Extreme Heat Warning criteria were reached on three straight days.

Wider weather episode

High pressure slowly strengthening overhead pushed temperatures in the Mojave Desert to dangerous levels.

Source: NOAA Storm Events Database, event_id 1293175. Narrative written by the NWS forecast office that issued the report.