A rapidly growing wildfire raged across an upscale section of Los Angeles on Tuesday, destroying homes and creating traffic jams as 30,000 people evacuated beneath huge plumes of smoke that covered much of the metropolitan area.

At least 2,921 acres (1,182 hectares) of the Pacific Palisades area between the coastal settlements of Santa Monica and Malibu had burned, officials said, after they had already warned of extreme fire danger from powerful winds that arrived following extended dry weather.

The fire spread as officials warned the worst wind conditions were expected to come overnight, leading to concerns that more neighborhoods could be forced to flee. The city of Santa Monica later ordered evacuations in the northern fringe of town.

Witnesses reported a number homes on fire with flames nearly scorching their cars when people fled the hills of Topanga Canyon, as the fire spread from there down to the Pacific Ocean.

"We feel very blessed at this point that there's no injuries that are reported," Los Angeles Fire Chief Kristin Crowley told a press conference, adding that more than 25,000 people in 10,000 homes were threatened.

Firefighters in aircraft scooped water from the sea to drop it on the nearby flames. Flames engulfed homes and bulldozers cleared abandoned vehicles from roads so emergency vehicles could pass, television images showed.

As the sun set over Los Angeles, towering orange flames illuminated the hills leading to Topanga Canyon.

The fire singed some trees on the grounds of the Getty Villa, a museum loaded with priceless works of art, but the collection remained safe largely because of preventive efforts to trim brush surrounding the buildings, the museum said.

With only one major road leading from the canyon to the coast, and only one coastal highway leading to safety, traffic crawled to a halt, leading people to flee on foot.

Cindy Festa, a Pacific Palisades resident, said that as she evacuated out of the canyon, fires were "this close to the cars," demonstrating with her thumb and forefinger.

"People left their cars on Palisades Drive. Burning up the hillside. The palm trees - everything is going," Festa said from her car.

Before the fire started, the National Weather Service had issued its highest alert for extreme fire conditions for much of Los Angeles County from Tuesday through Thursday, predicting wind gusts of 50 to 80 mph (80 to 130 kph).

With low humidity and dry vegetation due to a lack of rain, the conditions were "about as bad as it gets in terms of fire weather," the Los Angeles office of the National Weather Service said on X.

Governor Gavin Newsom, who declared a state of emergency, said the state positioned personnel, firetrucks and aircraft elsewhere in Southern California because of the fire danger to the wider region, he added.

"Hopefully, we're wrong, but we're anticipating other fires happening concurrently," Newsom told the press conference.

A second blaze dubbed the Eaton Fire later broke out some 30 miles (50 km) inland in the foothills above Pasadena, consuming 200 acres (80 hectares), Cal Fire said.

The powerful winds changed President Joe Biden's travel plans, grounding Air Force One in Los Angeles. He had planned to make a short flight inland to the Coachella Valley for a ceremony to create two new national monuments in California but the event was rescheduled for a later date at the White House.

"I have offered any federal assistance that is needed to help suppress the terrible Pacific Palisades fire," Biden said in statement. A federal grant had already been approved to help reimburse the state of California for its fire response, Biden said.

Pacific Palisades is home to several Hollywood stars. Actor James Woods said on X he was able to evacuate but added, "I do not know at this moment if our home is still standing."

Actor Steve Guttenberg told KTLA television that friends of his were impeded from evacuating because others had abandoned their cars in the road.

"It's really important for everybody to band together and don't worry about your personal property. Just get out," Guttenberg said. "Get your loved ones and get out."