And about 150 miles (240 kilometers) to the west of the Dixie Fire, the lightning-sparked McFarland Fire threatened remote homes along the Trinity River in the Shasta-Trinity National Forest.
The fire was only 5% contained after burning through nearly 25 square miles (65 square kilometers) of drought-stricken vegetation.
Similar risky weather was expected across Southern California, where heat advisories and warnings were issued for interior valleys, mountains and deserts for much of the week. Heatwaves and historic drought tied to climate change have made wildfires harder to fight in America's West.
Scientists say climate change has made the region much warmer and drier in the past 30 years and will continue to make weather more extreme and wildfires more frequent and destructive.