Authorities said the Oak Fire, which is zero percent contained, was threatening to destroy about 2,000 homes on Saturday and some 3,000 people were evacuated. By early Sunday, media reports said 6,000 people had been told to leave.
"Today the weather is expected to remain hot with minimum humidity between 5 and 10%, which will hamper firefighting efforts," a fire report posted early Sunday said. "High tree mortality and dense fuels are throughout the fire area." Yosemite, about an hour's drive from Mariposa County, is home to some of the largest and oldest sequoia trees in the world. The redwoods were threatened by another blaze earlier this month, but firefighters managed to save them.