More than 100,000 people were ordered to evacuate as dry, hurricane-force winds hindered firefighting operations and spread the fires, which have burned parched terrain almost unimpeded since they began on Tuesday. 

"This firestorm is the big one," Los Angeles Mayor Karen Bass told a press conference after rushing back to Los Angeles upon cutting short an official trip to Ghana. 

A new fire broke out in the Hollywood Hills on Wednesday evening, Fire Chief Kristin Crowley told a press conference, forcing more evacuations and raising to six the number of wildfires burning in Los Angeles County.

Four of them were 0% contained according to state officials, including a pair of major conflagrations on the eastern and western flanks of the city that continued to grow as night fell on Wednesday. 

In between, the so-called Sunset Fire in Hollywood Hills scorched 50 acres (20 hectares) on Wednesday, Cal Fire said. Helicopter crews doused the flames with water drops, appearing to impede its rapid advance.

The L.A. Fire Department issued an evacuation order for people in an area within Hollywood Boulevard to the south, Mulholland Drive to the north, the 101 Freeway to the east and Laurel Canyon Boulevard to the west - all iconic addresses for people in the entertainment industry.

Within that area is the Dolby Theater, where the Oscars are held. Next week's Oscar nominations announcement was already postponed by two days because of the fire, organizers said. 

Though relatively small compared to the others, the Sunset Fire burned just above Hollywood Boulevard and its Walk of Fame. It would need to cross the 101 Freeway to endanger the Hollywood sign and Griffith Observatory further up in the hills. 

On the west side of Los Angeles, the Palisades Fire consumed 15,832 acres (6,406 hectares) and hundreds of structures in the hills between Santa Monica and Malibu, racing down Topanga Canyon until reaching the Pacific Ocean on Tuesday. 

Aerial video by KTLA television showed block after block of smoldering homes in Pacific Palisades, the smoky grid occasionally punctuated by the orange blaze of another home still on fire.

To the east, in the foothills of the San Gabriel Mountains, the Eaton Fire claimed another 10,600 acres (4,289 hectares), another 1,000 structures, and killed at least five people, officials said. 

Private forecaster AccuWeather estimated initial damage and economic loss at more than $50 billion.

"We're facing a historic natural disaster. And I think that can't be stated strong enough," Kevin McGowan, director of emergency management for Los Angeles County, told a press conference.

Even though forecasters said winds would subside briefly on Wednesday night, so-called red flag conditions were expected to remain until Friday.

Nearly 300,000 homes and businesses lost power in Los Angeles County, down from nearly 1 million earlier on Wednesday, according to PowerOutage.us. School was canceled throughout Los Angeles County at least through Thursday, Superintendent Alberto Carvalho said.