Thousands fled their homes as major wildfires encroached on a charred area of Northern California still recovering from severe blazes in recent years, sparking concern the state may be in for another destructive series of wildfires this summer.

California officials said unusually hot weather, high winds and highly flammable vegetation turned brittle by drought helped fuel the fires that began over the weekend, the same conditions that led to the state’s deadliest and most destructive fire year in 2017.

Gov. Jerry Brown on Monday declared a state of emergency in Lake County, where the biggest fire was raging about 120 miles north of San Francisco, a rural region particularly hard-hit by fires in recent years. The declaration will enable officials to receive more state resources to fight the fire and for recovery.

Jim Steele, an elected supervisor, said the county is impoverished and its fire-fighting equipment antiquated. He also said the county has just a few roads into and out of the region, which can hinder response time. Steele said the area has also been susceptible to fire for many decades because dense brush and trees in the sparsely populated area, but the severity of the latest blazes is unexpected.

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