Officials in Glenn County, in the northern Central Valley about halfway between Sacramento and Redding, are enforcing some mandatory evacuations after the Mendocino Complex Fire spread an additional 8,895 acres overnight.
Cal Fire Public Information Officer Derek Tisinger said his team is expecting fire activity to increase again Monday afternoon with strong winds and warmer, drier conditions.
"We're going to have westerly winds," Tisinger said. "This will increase the rate of fire spread to the east, especially as it lines up with the topography, such as drainages and canyons."
Tisinger said the blaze is currently nearly 80 percent contained.