An SUV sits buried by a mudslide in the Beverly Crest area of Los Angeles. A storm of historic proportions unleashed record levels of rain over parts of Los Angeles on Monday, endangering the city's large homeless population, sending mud and boulders down hillsides dotted with multimillion-dollar homes and knocking out power for more than a million people in California.

Firefighters rescue a dog from a homeless encampment that became surrounded by floodwater in the Santa Ana River during a rainstorm in San Bernardino, California.

A whirlpool forms around a city worker in the Holmby Hills neighborhood of Los Angeles as he lifts a manhole cover to clear street flooding.

A Christmas tree is washed down the gutter of the Hollywood Hills in Los Angeles. The second of back-to-back atmospheric rivers took aim at Southern California, unleashing mudslides, flooding roadways and knocking out power as the soggy state braced for another day of heavy rains.

Two vehicles, one towing a trailer, sit in the rocks on the bank of a swollen Cajon Creek near Devore after being swept away in the floodwaters the night before.

Workers clear a tree that fell onto a home during heavy wind and rain in San Jose, California.

A man walks his dog on the edge of the Los Angeles River, carrying stormwater downstream in Los Angeles.

Waves crash over a breakwater in Alameda, California, with the San Francisco skyline in the background. High winds and heavy rainfall are impacting the region.

A boater stands on the bow of an anchored sailboat as waves crash over a breakwater in Alameda, California.

Search and rescue workers evacuate men from a homeless encampment that became surrounded by floodwater from the Guadalupe River in San Jose, California.