The National Weather Service issued a Red Flag Warning for the Lower Colorado River Valley in California beginning 00:12 on June 26 and continuing until 20:00 on June 27. The alert covers California zones along the river corridor and adjacent Arizona areas including Yuma/Martinez Lake and Vicinity, while a broader Fire Weather Watch remains in place from June 24 through June 27 across the Mojave Desert and Death Valley National Park. Last update: June 26, 2026.
Why the upgrade matters for river corridor and desert fuels
Forecast winds of 15 to 25 mph with gusts up to 50 mph and relative humidity as low as 5% create conditions favorable for rapid ignition, fast spread, and long-range spotting across dry brush and river corridor fuels. The Red Flag Warning indicates critical fire weather is occurring or imminent, while the watch remains a planning signal that critical conditions are possible across the wider desert areas through late June 27.
Coverage, timing and affected areas through June 27
The Red Flag Warning is in effect for the Lower Colorado River Valley CA and nearby Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ from 00:12 on June 26 to 20:00 on June 27. The Fire Weather Watch has been active since June 24, with issuance times varying by zone from late morning to early afternoon; some California desert locations remain under watch until 20:00 on June 27, while others—including the Mojave Desert and Death Valley National Park—extend to 23:00 on June 27. Minimum humidity across the watch area is expected between 5% and 15%, with some locations near 5%.
Safety guidance and operational readiness
Officials advise avoiding all outdoor burning and open flames, properly discarding cigarettes, and keeping defensible space clear of dry vegetation around structures to reduce ignition risk under critical fire weather. Communities and businesses should notify appropriate officials and fire crews of any planned activities, monitor local updates for possible additional upgrades, and be ready to evacuate if necessary. For emergencies, dial 911 and follow guidance from the National Weather Service and local authorities as conditions evolve.