The danger for more destruction is so high that the US Forest Service announced Monday it was closing all eight national forests in the southern half of the state, reports AP.

After a typically dry summer, California is parched heading into fall and what normally is the most dangerous time for wildfires. Two of the three largest fires in state history are burning in the San Francisco Bay Area.

More than 14,000 firefighters are battling those fires and dozens of others more around California.

A three-day heat wave brought triple-digit temperatures to much of the state during Labor Day weekend. But right behind it was a weather system with dry winds that could fan fires.

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The state's largest utility, Pacific Gas & Electric, was preparing to cut power to 158,000 customers in 21 counties in the northern half of the state to reduce the possibility its lines and other equipment could spark new fires.

Randy Moore, regional forester for the Forest Service’s Pacific Southwest Region that covers California, announced the national forest closures and said the decision would be re-evaluated daily.

Campgrounds at all national forests in the state also were closed.

“The wildfire situation throughout California is dangerous and must be taken seriously," Moore said. “Existing fires are displaying extreme fire behavior, new fire starts are likely, weather conditions are worsening, and we simply do not have enough resources to fully fight and contain every fire."

Lynne Tolmachoff, spokeswoman for the California Department of Forestry and Fire Protection, or Cal Fire, said it's “unnerving" to have reached a record for acreage burned when September and October usually are the worst for fires because vegetation has dried out and high winds are more common.

The previous high was 1.96 million acres burned in 2018. Cal Fire began tracking the numbers in 1987.

While the two mammoth Bay Area fires were largely contained after burning for three weeks, firefighters struggled to corral several other major blazes ahead of the expected winds.

Evacuation orders were expanded to more mountain communities Monday as the largest blaze, the Creek Fire, churned through the Sierra National Forest in Central California.

It was one of many recent major fires that has displayed terrifyingly swift movement. The fire moved 24 kilometers in a single day and burned 145.04 square kilometers.