The Mountain fire, which began Monday, was 25-percent contained but commanders said the weather and fuel supply in the area added up to a high potential for further growth.
The Riverside County Sheriff's Department issued a new evacuation order for the small mountain town of Pine Cove. The threat was not so much due to approaching flames as it was to poor air quality caused by smoke lingering in the area.
More than a dozen structures and several vehicles have been destroyed since the blaze broke, the Los Angeles Times said.
California Lt. Gov. Gavin Newsom declared a state of emergency in Riverside County Friday night. The declaration opens the door for state agencies to assist in firefighting and recovery efforts.