Huge California wildfire chews through timber in very hot and dry weather

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In Northern California, firefighters battled the reawakened Park Fire, a massive blaze that re-exploded Monday after several days of slumber and grew by as much as 20 square miles, mostly in about 12 hours. (AP Video: Noah Berger)

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A firefighter uses a drip torch to burn vegetation while trying to stop the Park Fire from near Mill Creek in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A firefighter walks through haze as the Park Fire burns near the Mineral community of Tehama County, Calif. on Wednesday, Aug. 7, 2024 (AP Photo/Noah Berger)

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Flames from a spot fire rise above trees along State Route 172 as the Park Fire burns in the Mill Creek community of Tehama County, Calif. on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A helicopter drops retardant while trying to keep the Park Fire from spreading in the Mineral community of Tehama County, Calif., on Tuesday, Aug. 6, 2024. (AP Photo/Noah Berger)

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Firefighters work to keep a spot fire from growing along State Route 172 as the Park Fire burns in the Mill Creek community of Tehama County, Calif. on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A firefighter uses a drip torch to burn vegetation while trying to stop the Park Fire from near Mill Creek in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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Flames leap above trees as the Park Fire burns in the Mineral community of Tehama County, Calif., on Tuesday, Aug. 6, 2024. (AP Photo/Noah Berger)

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A firefighter uses a drip torch to burn vegetation while trying to stop the Park Fire from near Mill Creek in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A firefighter uses a drip torch to burn vegetation while trying to stop the Park Fire from near Mill Creek in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A firefighter works to protect a structure as the Park Fire approaches in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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Firefighters work to keep a spot fire from growing as the Park Fires burns along State Route 172 in the Mill Creek community of Tehama County, Calif. on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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Firefighters work to keep a spot fire from growing as the Park Fire burns along State Route 172 in the Mill Creek community of Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

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A firefighter uses a drip torch to burn vegetation while trying to stop the Park Fire from near Mill Creek in Tehama County, Calif., on Wednesday, Aug. 7, 2024. (AP Photo/Noah Berger)

CHICO, Calif. (AP) — California’s largest wildfire so far this year continued to grow Thursday as it chewed through timber in very hot and dry weather.

The Park Fire has scorched more than 660 square miles (1,709 square kilometers) since erupting July 24 near the Sacramento Valley city of Chico and burning northward up the western flank of the Sierra Nevada. Containment remained at 34%, Cal Fire said.

The conflagration’s early explosive growth quickly made it California’s fourth-largest wildfire on record before favorable weather reduced its intensity late last week. It reawakened this week due to the heat and very low relative humidity levels.

A large portion of the burned area was in mop-up stage but spot fires were a continuing problem, officials said during Thursday morning’s operational briefing.

The fire’s northeast corner was the top firefighting priority, operations deputy Jed Gaines said.

“It’s not time to celebrate,” he said. “We got several more days of hard work to hold what we got in there.”

The latest Park Fire assessments found 636 structures destroyed and 49 damaged. A local man was arrested after authorities alleged he started the fire by pushing a burning car into a gully in a wilderness park outside Chico.

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About 100 miles (160 kilometers) to the south, a new forest fire in El Dorado County was exhibiting extreme behavior, and some Park Fire aircraft were being diverted there.

The Crozier Fire, about 10 miles (16 kilometers) north of Placerville, had burned more than 2 square miles (5.17 square kilometers) of timber and chaparral as of Thursday evening and was just 5% contained. The fire threatens 1,625 structures, according to Cal Fire.

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This story has been corrected to show that the Crozier Fire has burned 5.17 square kilometers, not 3.2 square kilometers.