A wildfire, officially dubbed the Alamo Fire, broke out near Santa Maria in Santa Barbara County Thursday afternoon, quickly growing from 500 to 3,000 acres on Friday.
Meanwhile in northern California, officials have ordered the evacuation of more than 300 homes in Butte County due to another wildfire, a spokeswoman for Cal Fire said.
Santa Barbara officials sent alerts to residents and campers near Cachuma Lake to evacuate as the fire spread.
The cause of the fire is unknown and under investigation. On Saturday, authorities lifted an evacuation order in Landusky, Montana, in the Little Rocky Mountains south of the Fort Belknap Indian Reservation.
An excessive heat warning was extended until 11pm (local time) for much of southern California, with temperature records being broken.
The fire was one of several threatening homes around the state during a heat wave that has made it hard on firefighters.
Evacuation orders have been issued for Farren Road, West Camino Cielo from the Winchester Gun Club east to Highway 154 and Kinevan Road, and Highway 154 from Armour Ranch Road to Paradise Road.
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Five helicopters made water drops Saturday, while four fixed-wing air tankers made retardant drops, with the main focus on structure defense, according to County Fire.
Santa Barbara County Sheriff's Office issued an immediate evacuation for the Highway 154 corridor.
Mike Eliason, Santa Barbara County Fire Dept.
He said he looked off in the distance, saw the smoke, and tried to head back away from the fire but was turned away at the highway.
The nearby Whittier Fire, now the third-largest wildfire, barreled over more than 5,000 acres and engulfed Los Padres National Forest.
"The fire continues to burn actively", the California Department of Forestry and Fire Protection reported on its incident page.
The Whittier Fire is now at 7,800 acres and is 5 percent contained.