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California firefighters made gains against the state’s deadliest and largest wildfire of the year, but forecasters warned Thursday that spiking temperatures and plunging humidity levels could create conditions for further growth.

After five days of no containment, the McKinney Fire in Siskiyou County near the Oregon border was 10 per cent surrounded by Wednesday evening. Bulldozers and hand crews were making progress carving firebreaks around much of the rest of the blaze, fire officials said.

At the fire’s southeastern corner, evacuation orders for sections of Yreka, home to about 7,800 people, were downgraded to warnings, allowing residents to return home but with a caution that the situation remained dangerous.

About 1,300 people remained under evacuation orders, officials said at a community meeting Wednesday evening.

The fire didn’t advance much at mid-week, following several days of brief but heavy rain from thunderstorms that provided cloudy, damper weather. But as the clouds clear and humidity levels drops in the coming days, the fire could roar again, authorities warned.

“This is a sleeping giant right now,” said Darryl Laws, a unified incident commander on the blaze.

Weekend temperatures could reach triple digits as the region dries out again, said meteorologist Brian Nieuwenhuis with the National Weather Service office in Medford, Oregon.

“The heat, the dry conditions, along with afternoon breezes, that’s the kind of thing that could keep the fire pretty active,” he said Thursday.

The blaze broke out last Friday and has charred nearly 238 square kilometres of forestland, left tinder-dry by drought. More than 100 homes and other buildings have burned and four bodies have been found, including two in a burned car in a driveway.

The blaze was driven at first by fierce winds ahead of a thunderstorm cell. More storms earlier this week proved a mixed blessing. A drenching rain Tuesday dumped up to 7.6 cm on some eastern sections of the blaze but most of the fire area got next to nothing, said Dennis Burns, a fire behaviour analyst.

The latest storm also brought concerns about possible river flooding and mudslides. A private contractor in a pickup truck who was aiding the firefighting effort was hurt when a bridge gave out and washed away the vehicle, Kreider said. The contractor had non-life-threatening injuries, she said.

The progress against the flames came too late for many people in the scenic hamlet of Klamath River, which was home to about 200 people before the fire reduced many of the homes to ashes, along with the post office, community centre and other buildings.

At an evacuation centre Wednesday, Bill Simms said that three of the four victims were his neighbours. Two were a married couple who lived up the road.

“I don’t get emotional about stuff and material things,” Simms said. “But when you hear my next-door neighbours died … that gets a little emotional.”

Their names haven’t been officially confirmed, which could take several days, said Courtney Kreider, a spokesperson with the Siskiyou County Sheriff’s Office.

Simms, a 65-year-old retiree, bought his property six years ago as a second home with access to hunting and fishing. He went back to check on his property Tuesday and found it was destroyed.

“The house, the guest house and the RV were gone. It’s just wasteland, devastation,” Simms said. He found the body of one of his two cats, which he buried. The other cat is still missing. He was able to take his two dogs with him to the shelter.

Harlene Schwander, 82, lost the home she had just moved into a month ago to be closer to her son and daughter-in-law. Their home survived but her house was torched.

Schwander, an artist, said she only managed to grab a few family photos and some jewellery before evacuating. Everything else – including her art collection – went up in flames.

“I’m sad. Everybody says it was just stuff, but it was all I had,” she said.

Meanwhile, firefighters expected Thursday to fully surround a 404-hectare spot fire on the northern edge of the McKinney Fire.

California and much of the rest of the West is in drought and wildfire danger is high, with the historically worst of the fire season still to come. Fires are burning in Montana, Idaho and Nebraska and have destroyed homes and threaten communities.

Scientists say climate change has made the West warmer and drier over the last three decades and will continue to make weather more extreme and wildfires more frequent and destructive. California has seen its largest, most destructive and deadliest wildfires in the last five years. In 2018, a massive blaze in the Sierra Nevada foothills destroyed much of the city of Paradise and killed 85 people, the most deaths from a U.S. wildfire in a century.

In northwestern Montana, a fire that has destroyed at least four homes and forced the evacuation of about 150 residences west of Flathead Lake continued to be pushed north by winds on Wednesday, fire officials said.

The Moose Fire in Idaho has burned more than 220 square kilometres in the Salmon-Challis National Forest while threatening homes, mining operations and fisheries near the town of Salmon.

And a wildfire in northwestern Nebraska led to evacuations and destroyed or damaged several homes near the small city of Gering.

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