The National Weather Service issued a Red Flag Warning early June 26 for parts of the Lower Colorado River Valley in California and adjacent Arizona, upgrading portions of a multi-day fire weather watch that began June 24 across desert regions including the Mojave and Death Valley. The warning remains in effect through June 27 at 20:00 for the Lower Colorado River Valley CA and Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ.
The escalation matters because forecast winds and very low humidity can accelerate new or existing ignitions, threatening people, property and critical infrastructure along open desert and river corridor fuels. Authorities advised residents and visitors to avoid outdoor burning, maintain defensible space, and be prepared for rapid changes in conditions as additional areas could see upgrades if criteria persist. Last update: 26 June 2026.
Red Flag Warning in Lower Colorado River Valley through June 27
The warning took effect at 00:12 on June 26 and extends until 20:00 on June 27 for Lower Colorado River Valley CA and neighboring Arizona zones including Yuma/Martinez Lake and Vicinity. Forecast winds range from 15 to 25 mph with gusts up to 50 mph, while minimum relative humidity may fall to near 5 percent. These conditions support rapid fire spread and long-range spotting along the river corridor and adjacent desert brush, where fine fuels are dry and continuity is high.
Under a Red Flag Warning critical fire weather conditions are occurring or imminent. Fire management agencies typically pre-position resources, restrict nonessential ignitions and monitor for new starts. Communities in the warning area were urged to follow local guidance, report any smoke sightings promptly, and be ready to evacuate if orders are issued.
Fire Weather Watch continues for Mojave and Death Valley
Beyond the Lower Colorado River Valley, the broader Severe Fire Weather Watch remains in place across the Mojave Desert and Death Valley National Park through June 27, with end times varying by zone. In several desert locations, the watch runs until 23:00 on June 27, serving as a planning signal that critical conditions are forecast and additional upgrades are possible if thresholds are met. Issuance times have varied by area since June 24, from late morning to early afternoon starts.
Within these watch areas, forecast winds of 15 to 30 mph with gusts between 45 and 50 mph and relative humidity of 5–15 percent are expected. Communities and businesses were advised to inform officials of any planned activities that could spark fires, secure equipment that might emit sparks, and monitor local updates for potential warning upgrades.
Forecast conditions and public guidance
Across the affected deserts, the combination of strong winds, very low humidity, and receptive fuels can produce rapid rates of spread and spotting ahead of a fire front. River corridor vegetation can carry flames efficiently when winds align with channels, while open desert brush supports quick ignition and growth. These factors elevate risk to travel routes, recreation sites and utility corridors during the alert period.
Officials urged the public to avoid all outdoor burning and open flames, properly discard cigarettes, and maintain defensible space free of dry vegetation around structures. Those in the watch and warning areas should stay alert to additional updates, be prepared for changing conditions, and dial 911 for emergencies.