San Diego ? A 6,600-acre wildfire forced the evacuation of more than a hundred homes in rural San Diego County, and authorities warned Monday that two other communities with a total of 1,350 homes could be next.

The fire, burning across more than 10 square miles in Cleveland National Forest, was the latest in a series of blazes around California that have put fire crews to work in temperatures of 100 degrees or more.

It prompted deputies to order 125 homes evacuated in the town of Alpine starting Sunday. Residents throughout parts of Pine Valley and Lake Morena, where there are about 1,350 homes combined, were told to remain on standby, said sheriff’s spokeswoman Susan Plese.

Monday’s high in the Cleveland forest had been expected to be 105 degrees, officials said.

This fire season is on pace to be the worst year for wildfires this decade, the National Interagency Fire Center reported Monday.