Firefighters combating one of the biggest blazes in California history have been making headway, officials said Wednesday, but they warned that with gusty winds forecast, the region still faced the risk of “extreme fire behavior” through Friday.

The wildfires burning through the region in and around Los Angeles have consumed swaths of Southern California since last week, destroying more than 1,000 buildings – most of them single-family residences – and threatening thousands more. These fires, and the painful wildfire season that has ravaged the state this year, have been historic in scope and size: The largest active blaze – the Thomas Fire that erupted 10 days ago in Ventura County and spread into neighboring Santa Barbara – is already the fifth-largest California wildfire on record, according to Cal Fire.

Ventura County fire officials said Wednesday that firefighters responding to the Thomas Fire reported “good progress” overnight. But even as authorities said the blaze was 25 percent contained, it had still grown to expand across more than 370 square miles, and ferocious winds continued to pose a danger.

“Firefighters will remain engaged in structure defense operations and scout for opportunities to establish direct perimeter control,” officials said in an announcement Wednesday morning.

Evacuation orders for several areas have been lifted, including across the Ojai Valley that saw extreme danger last week. The Thomas Fire has been blamed for the only death authorities have attributed so far to the recent spate of blazes. Last week, medical examiners in Ventura said that a 70-year-old woman had been killed by “blunt force injuries with terminal smoke inhalation and thermal injuries” during the evacuation.

What caused this blaze remains under investigation, officials said, which is also the case for many of the other recent fires that have forced evacuationsj ande destroyed buildings.

California Gov. Jerry Brown, D, has called these blazes “the new normal.” Dry foliage, combined with powerful winds, provided wildfires with the fuel to expand and grow in an “extreme” way.

Forecasts suggested that there would be still new dangers ahead. The National Weather Service said that “red flag warnings” of heightened fire risk would remain through Friday morning over the Los Angeles and Ventura County mountains and the Ventura County and Santa Clarita valleys, with winds project to reach 50 mph in the coming days.

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