Officials in San Bernardino County, California, issued an evacuation after a brush fire spread to over 7,000 acres.

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.

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 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.

A wildfire that ignited in western Fresno County near the Monterey County line doubled in size over the past 24 hours, pumping out massive amounts of smoke and triggering a series of evacuations, officials said.

Firefighters battling a California wildfire that has burned through more than 5 square miles of the high Sierra made significant progress slowing its growth on Wednesday, but hundreds of residents whose homes are threatened remained under evacuation orders.

A blaze near the remote Northern California mountain community of Sierra Brooks was uncontained. Authorities expanded evacuation orders for a total of more than 530 residents Tuesday evening after strong winds pushed flames through dry brush and timber about 50 miles north of Lake Tahoe.

A wildfire that ignited in western Fresno County near the Monterey County line doubled in size over the past 24 hours, pumping out massive amounts of smoke and triggering a series of evacuations, officials said.