Firefighters outflank California blaze

Weary firefighters in Northern California are outflanking a deadly, 10-day-old blaze that has destroyed over 1,000 homes as authorities reopen more evacuated neighbourhoods and the last few people listed as missing are found alive.

Aided for a third straight day by diminished winds, ground crews on Wednesday extended buffer lines carved out of thick, dry brush along the fire's edge to 35 per cent of its perimeter, with partial containment lines continuing even farther, officials said.

That marked a substantial improvement from the weekend, when the Carr Fire raged mostly unchecked after laying waste to neighbourhoods in and around Redding, a city of 90,000 people about 257kilometres north of the state capital, Sacramento.

Having scorched more than 48,967 hectares, an area larger than New Orleans, the blaze was the biggest of 16 major wildfires burning throughout California and the most formidable of more than 90 across 13 Western states from Texas to Alaska.

California Department of Forestry and Fire Protection (CalFire) commanders said the Carr Fire, sparked by a vehicle on July 23, was burning with far less intensity this week and posed little immediate threat to populated areas.

"We are making good progress on the fire," CalFire Deputy Chief Bret Gouvea told reporters at a mostly upbeat news briefing in Redding. Crews "still have quite a bit of work to do" to shore up containment lines, he said.

A status update issued hours later said a "fire weather watch" would go into effect for Thursday evening through Saturday, with increasing winds in the forecast.

Strong gusts kicking up along the upper ridge lines on Wednesday night were a cause for concern on the fire's rugged western flanks, a few miles from the town of Lewiston, which remained evacuated.

Elsewhere, fire authorities, utility crews and police were stepping up efforts to remove hazards such as downed power lines and ruptured gas lines to allow evacuees to return as quickly as possible to areas no longer threatened.

"Repopulation is the theme," Gouvea said.

Redding Police Chief Roger Moore, who lost his own home in the fire, said social workers and clergy would be on hand to lend support to distressed residents.

"We recognise that as people enter back into their neighborhoods, they're going to know people, family members and neighbours that have lost homes," Moore said. "It's a very emotional period. It takes a toll on people."

As many as 38,000 residents were under evacuation orders at the height of the fire late last week. CalFire director Ken Pimlott said more than 32,000 remained displaced by various fires up and down the state.

In another sign the crisis in Redding was ebbing, law enforcement officials said the last four people reported as missing among a list of 20 whose names were published on Tuesday were located safe and sound on Wednesday.

Six people were killed in the Carr Fire, including two firefighters, two children who perished with their grandmother in a house that burned, and a man who defied an evacuation order to stay put in another home that was consumed by the fire.