The flames raced up steep terrain, chewing through thick vegetation as they approached Running Springs, a mountain community.

The small community of Running Springs has been ordered to evacuate because of the Line Fire, while Lake Arrowhead and areas to its west are under an evacuation warning.

Some Southern California residents were forced from their homes Saturday after an explosive wildfire grew by more than 3,000 acres in mere hours – and is burning so intensely that it is creating its own weather.

More than 35,000 structures are threatened by the fire, including homes and commercial buildings, according to Cal Fire

The Line Fire in San Bernadino County quadrupled in size over the weekend of Sept. 7, scorching more than 17,000 acres, forcing evacuations and prompting California Gov. Gavin Newsom (D) to declare a state of emergency in the county.

Residents of hundreds of homes near the San Bernardino National Forest in southern California were ordered to evacuate Saturday as the Line Fire grew exponentially.

The massive Line Fire exploded to 17,459 acres Sunday in Southern California's San Bernardino County, threatening thousands of structures and bringing expanded mandatory evacuation orders.

The fast-growing wildfire in San Bernadino County the south of the state is threatening communities, prompting the governor's declaration.

The Line Fire more than quadrupled in size on Saturday and led to evacuation orders for more than 5,000 people. A heat wave raises the risk that more fires could start.