Photos: The Apple Fire in San Bernardino National Forest, California

A vegetation fire that broke out Friday afternoon has now charred more than 26,000 acres in the Inland Empire, officials said.

Crews battling the Apple fire, which is burning north of Cherry Valley in Riverside County, will have to contend with challenging weather conditions Monday, with warm temperatures and strengthening afternoon winds expected.

The fire has burned 26,450 acres and was 5% contained as of Monday morning, according to the California Department of Forestry and Fire Protection.

"Much of the fire activity is being driven by the record-low moisture content of the vegetation in the area combined with high temperatures and low relative humidity," officials wrote in an incident update. "These conditions are contributing to active fire behavior both day and night."

Officials added that the blaze _ which was first reported at 4:55 p.m. Friday _ is "burning in an area with no recent fire history."

Roughly 2,300 fire personnel are working to douse the flames.

Multiple evacuation orders and warnings were put in place Sunday in Riverside and San Bernardino counties. Roughly 7,800 residents in more than 2,500 households have been ordered to evacuate, officials said. – Associated Press

Photos by The Los Angeles Times and Associated Press