Heavy overnight storm in Northern California killed two people in a submerged automobile, while officials in a fire-ravaged Southern California canyon region advised evacuations on Thursday due to potential debris and mud flows.

Firefighters in Millbrae rescued two persons who had climbed atop a flooded underpass. However, they were unable to reach passengers in a totally submerged automobile, according to Javier Acosta, Detective of San Mateo County Sheriff.

An evacuation alert was issued for around 150 residences of Twain Harte Lake Dam in the Sierra Nevada after fissures were discovered in granite that combines the artificial component of the 11-meter structure.

Authorities started releasing some of the water, but the dam did not seem to be in imminent danger, according to the Tuolumne County sheriff.

The warnings for Southern California after precipitation that had primarily fallen in Northern California this week extended throughout the state. Heavy rain fell in the southern section of the state Thursday night.

Previously, firemen utilized a litter basket in order to rescue a guy who had been stuck on a bridge pillar over the Los Angeles River.

The NWS issued a warning for moderate flooding of highways and low-lying regions in counties around the San Francisco Bay, as well as an avalanche alert for backcountry areas in Inyo and Mono counties.

Flooding stopped a portion of a coastal Highway in County of San Luis Obispo, necessitating the use of tire chains on numerous main roads across the Sierra.

Starting Thursday evening, forecasters issued a flood warning for areas southeast and east of Los Angeles due to the possibility of heavy nighttime rain fueled by an atmospheric river.

Orange County officials issued an evacuation order for three valleys near a wildfire burn where the rain last week unleashed muddy floods.

San Bernardino County officials issued voluntary evacuation warnings for a half-dozen mountain locations.

Rain and snow are expected in California through Xmas and into the next week. Forecasters say snow levels in the north might plummet to 1,000 feet or lower by Sunday, advising holiday visitors to be prepared.

“Foothill locations that do not normally receive snow should prepare for winter conditions, especially from Sunday morning through Tuesday morning,” the Sacramento weather office said.