In Los Angeles, residents were sent warnings for flash floods on Sunday.

The alerts advised people not to travel unless evacuating or “fleeing the area” due to a “dangerous and life-threatening” situation.

Hundreds of thousands of people have been left without power as an intense tropical storm continues to rage across California.

Three people have been confirmed dead by authourities, with many others being displaced by mudslides and flash flooding.

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Four people were found safe after an avalanche north of Las Vegas, authorities said on Monday.

The avalanche was reported in Lee Canyon, about 50 miles northwest of downtown Las Vegas, according to Clark County officials.

Las Vegas police said in a post on X the avalanche triggered a search-and-rescue effort after “several” people were reported missing. Police later on Monday said four people were reported missing.

“Everyone has been located and is safe. We are currently assisting people off the mountain,” police said in a follow-up post.

The National Weather Service (NWS) said tornadoes were unlikely, but “not out of the question” as the second atmospheric river continues to batter California.

Monday saw extreme winds and rain across the state, prompting blackouts and mudslides. NWS meteorologist David Gomberg previously told CBS: “We do have a lot of low-level rotation in the atmosphere that could spawn some waterspout activity over coastal waters.

“And [it’s] not out of the question that we could get a brief small tornado across the region.”

Mr Gomberg added that “the most favourable” conditions for a tornado would have been on Sunday night and reiterated that the possibility of one is very slim.

The preliminary total damage and economic loss from the intense storms and record rainfall in California this week could be between $9 billion and $11 billion, according to AccuWeather.

The forecaster’s preliminary estimate largely accounts for damage to homes, businesses, infrastructure, facilities, roadways, and vehicles from both rain and snow, as well as over 900,000 reported power outages at the height of the storm.

There has also been significant disruption and costs to businesses from travel impediments including blocked roads, train delays, flight cancellations, rerouting, and shipping interruptions.

AccuWeather’s preliminary estimates reflects damage and negative impacts to the economy that have occurred through the end storm, as additional damage is expected to accrue as southern parts of the state through Monday night and until Thursday as thunderstorms continue.

The chief operating officer of California utility Pacific Gas & Electric has said that the storm that hit California on Sunday was one of the most damaging single-day storms on record in terms of outages.

According to NBC, Sumeet Singh called the storm that hit the company’s service area, which covers a huge area of the state from Northern to near Southern California, yesterday “intense.”

“In terms of outage totals, this was one of the top three most damaging single day storms on record,” he said, per the outlet, adding that wind gusts in northern counties including Marin and Santa Clara, were higher than 80 mph.

“The strong winds caused trees and other objects to fly into our equipment and take out power,” Mr Singh said.

All evacuation orders in Santa Barbara County were cancelled at 12pm on Monday, though officials warned that some roads and trails may still be inaccessible or closed throughout the county due to storm impacts.

The public was advised that ground saturation may cause continued rock falls, minor debris flows and landslides, and tree falls despite an ease in the rain.

Elsewhere in Ventura County, evacuation orders were downgraded to warnings. Access to the area remained limited due to storm damage.

The Ventura County Public Works Agency said it was working to restore access and estimated that the repair time would be approximately one week.