A brush fire in Warner Springs that began Thursday afternoon had burned 900 acres by Friday morning and was only 5 percent contained, with no control in sight, officials said.
"It's kicking up a lot of smoke right now," said Audrey Hagen, information officer for Cal Fire San Diego County.
The smoke was drifting over the mountains into Riverside County, Hagen said.
No buildings were threatened and no injuries were reported in the blaze, on Highway 79 and Chihuahua Valley Road, according to Hagen.
The blaze, dubbed the Chihuahua Fire, was sparked by lightning off Chihuahua Valley Road around 1 p.m. Thursday, and is burning southwest of Palomar Mountain, according to officials.
According to a report from KPBS.org, "Voluntary evacuation advisories went out around 7:30 p.m. Thursday for residents in the immediate area. Overnight, those advisories were bumped up to 'mandatory' evacuation orders."