Relentless rainstorms have killed at least 15 people in California and forced thousands to evacuate

California saw no relief from drenching rains on Tuesday as the latest in a relentless string of storms turned rivers into gushing flood zones and forced thousands of people to evacuate from towns with histories of deadly mudslides.

A woman died after her vehicle was caught in floodwater in San Luis Obispo on Monday, according to local media reports. On the central coast, a five-year-old boy vanished into the floodwaters after he was swept out of a stranded car.

In Sacramento, the state capital, local residents and family members were mourning the deaths of two unhoused people who were killed over the weekend when trees fell onto the tents where they were sleeping. Relatives and friends said their deaths highlighted the needs for thousands of more beds in local warming centers to protect unhoused residents during the coming storms, the Sacramento Bee reported.

In Santa Barbara, where schools and public transit systems were shut down in response to the intense weather, a local news station interviewed a man kayaking down a city block.

In Ventura county, a highway was temporarily closed on Monday night after multiple vehicles, including a semi truck, became stuck in the mud and debris on the road, leaving dozens of commuters trapped behind them, KTLA reported.

After a brief respite, another storm was expected to barrel into the state beginning on Wednesday, adding to the misery and further saturating areas already at risk of flooding and debris flows.

The death toll from the storms that began last week climbed to 16 on Tuesday, after two motorists were killed in a crash in central California caused by a tree struck by lightning that then fell on the road, the Los Angeles Times reported.

The storms threatened coastal and riverside towns and left nearly 190,000 homes and businesses without power by late Tuesday morning, according to the website poweroutage.us, which tracks utility reports. The weather service issued a flood watch through Tuesday for the entire San Francisco Bay Area, along with Sacramento Valley and Monterey Bay. Areas hit by wildfires in recent years faced the possibility of mud and debris sliding off denuded hillsides that have yet to fully recover their protective layer of vegetation.

California state highway authorities said late Monday night that parts of US and state highways were closed because of flooding, mud or rockslides, heavy snow or car spinouts and truck crashes.

Evacuation orders were issued in Santa Cruz county for about 32,000 residents living near rain-swollen rivers and creeks. The San Lorenzo River was declared at flood stage and drone footage showed numerous homes sitting in muddy brown water, the top halves of autos peeking out.

A roughly seven-hour search for the missing boy turned up only his shoe before officials called it off as water levels were too dangerous for divers, officials said.

About 130 miles (209km) to the south, about 10,000 people were ordered to evacuate in Santa Barbara county. County officials ordered 20 homes evacuated in the area of Orcutt after flooding and a sinkhole damaged up to 15 homes.

McLeod said she feels fortunate because her home sits on high ground and the power is still on. But she tires of the frequent evacuation orders since the huge wildfire followed by the deadly landslide five years ago.

Ellen DeGeneres shared an Instagram video of herself standing in front of a raging creek near the Montecito home where she lives with her wife, actor Portia de Rossi. She said in the post that they were told to shelter in place because they are on high ground.

Some miles down the coast another town, La Conchita in Ventura county, was ordered evacuated. A mudslide killed 10 people there in 2005.

In Ventura county, the Ventura River reached its highest level on record at more than 25ft (8 meters) on Monday. Firefighters using helicopters rescued more than a dozen people trapped on an island in the surging waters.

The storm also washed 3ft of mud and rock on to State Highway 126, stranding a long line cars and big-rig trucks. Crews worked into the night to pull them free.

In Los Angeles, a sinkhole swallowed two cars in the Chatsworth area on Monday night. Two people escaped by themselves and firefighters rescued two others who had minor injuries, authorities said.

A small mudslide also affected a few homes in the Hollywood Hills on Monday, CBS News reported.

Joe Biden issued an emergency declaration on Monday to support storm response and relief efforts in more than a dozen counties.

Much of California remains in severe to extreme drought, though the storms have helped fill depleted reservoirs.

The Associated Press and Reuters contributed