The non-injury blaze was reported shortly after 3 p.m.in the area of the 79 and Dump Road, near the Lamb Canyon landfill, according to the Riverside County Fire Department.
Officials couldn't immediately say how many homes or people are affected by the evacuation order.
Fire officials said Sunday they were hoping that upper level moisture would help them in their effort to douse the blaze that was 8 percent contained and destroyed at least 13 homes and eight outbuildings.
- The Latest on a major wildfire burning in Utah and others burning across the U.S. West.
Officials say the fire now covers almost 67 square miles and has destroyed more than a dozen homes since it was sparked a week ago.
Almost 1,000 firefighters battled a Utah wildfire that grew Sunday morning to almost 67 square miles (174 square kilometers) and has prompted the evacuation of 1,500 people from hundreds of homes and cabins.
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Thirty members of the Bureau of Land Management and Forest Service will spend 14 days helping to get the fire under control.
A number of communities in the area were forced to evacuate, including the entire town of Brian Head.
Los Angeles County sheriff's deputies were helping residents of some homes evacuate "out of an abundance of caution". There's also a chance for thunderstorms that could add more sparks.
The blaze was started June 17 by someone using a torch to burn weeds, with hot and windy weather conditions intensifying the flames over the past week.
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