A fast-spreading wildfire, spurred by powerful winds, continued to rage in Northern California on Friday and forced thousands of people to evacuate parts of Sonoma County — the rural wine country 75 miles north of San Francisco that is still recovering from a deadly 2017 blaze.

As the Kincade Fire cut a destructive path across the pastoral, vineyard-dotted area, Pacific Gas & Electric, the state’s largest utility, told state regulators that a jumper on one of its transmission towers broke close to where the fire started, near Geyserville.

Although PG&E cut power in the area Wednesday afternoon amid dangerous weather, stretches of the company’s high-voltage power transmission lines — which were responsible for the state’s deadliest wildfire ever — were still operating in the area when the fire broke out, the utility said in a statement.

In the report it filed with the California Public Utilities Commission, PG&E said it became aware of the transmission tower malfunction at 9:20 p.m. Wednesday. The fire began at 9:27 p.m., according to the California Department of Forestry and Fire Protection.

PG&E chief executive Bill Johnson said the company is conducting an internal investigation but has not accepted responsibility for the fire, adding that officials don’t know precisely how it started.

“We still, at this point, do not know what exactly happened,” he said at a news conference.

The Kincade Fire spread rapidly after it sparked late Wednesday night. Nearly 22,000 acres were charred by Friday morning, when fire officials announced that only 5 percent of the blaze had been contained.

At one point, the fire was growing at a rate of 30 football fields per minute. No injuries have been reported, but nearly 50 structures have been damaged or destroyed, officials said.

Meanwhile, 400 miles south, the rapidly expanding Tick Fire burned through Santa Clarita Valley and jumped a highway early Friday morning, triggering mandatory evacuations. The Los Angeles Unified School District announced that all schools in the San Fernando Valley would be closed on Friday “due to air-quality and safety concerns from the fires.”

The worst fire-weather conditions are expected to shift Friday from Northern California to southern parts of the state. Though winds in Northern California are still strong — up to 35 mph in the Sacramento Valley and topping 40-45 mph in the foothills and mountains — they are forecast to slacken some by Friday afternoon.

At the same time, the air in the vicinity of the Kincade Fire is slightly less dry and a bit cooler, which could offer a greater opportunity for firefighters to make gains on the blaze before more volatile conditions return this weekend.

But any relief won’t last long: Ahead of the next high-wind event, PG&E is gearing up for even greater blackouts — a desperate hedge against further wildfire risk.

The company said the next round of outages could begin Saturday and would be “on the magnitude” of those earlier this month, the most extensive planned power shutdown ever.

As the Kincade Fire spread, the Sonoma County Sheriff’s Office ordered mandatory evacuations, including for the entire community of Geyserville, and shut down several major roads.

“This is not the time to stay,” Sonoma Sheriff Mark Essick said at a news conference. “This is the time to go.”

As the wildfire torched Sonoma, and others spread in San Bernardino, Los Angeles County and elsewhere, Gov. Gavin Newsom (D) railed against all three of the state’s investor-owned power companies, including PG&E, which has already been forced into bankruptcy in the face of billions of dollars in liability claims stemming from previous fires.

“I must confess, it is infuriating beyond words,” Newsom said, accusing the utilities of neglecting their infrastructure and leaving the state vulnerable to fires sparked by outmoded power lines.

His statements echoed those he made two weeks earlier, when PG&E shut off power to nearly a million customers.

“It’s more than just climate change, and it is climate change, but it’s more than that,” Newsom said. “As it relates to PG&E, it’s about dog-eat-dog capitalism meeting climate change, it’s about corporate greed meeting climate change, it’s about decades of mismanagement.”

Newsom sent a letter Thursday to the CEOs of San Diego Gas & Electric Company, Edison International and PG&E demanding better communication about when the utilities would implement precautionary power shut-offs.

“The only consistency has been inconsistency,” he wrote.

In this case, PG&E cut off its lower-voltage distribution lines, which are more vulnerable to wind, but kept its higher-voltage transmission lines running, said Johnson, the utility’s chief.

He said the tower that broke down is 43 years old, which, he said, is “not an old tower.” Johnson said it has been inspected four times in the past two years.

“It appeared to have been in excellent condition, recently inspected,” he said.

The state’s electric infrastructure will face more tests in the next several days. Weather forecasts in Northern and Southern California have been ominous, portending more blackouts and, perhaps, more fires. The National Weather Service has said “pockets of critical fire weather” are likely.

The offshore gusts, known as El Diablo winds, bring extremely dry air, with relative humidity plummeting to the single digits in some cases, making firefighting particularly difficult. Forecasters expect a second round of those winds to blow across much of California in the coming days.

Meanwhile, in Southern California, an “extremely critical” fire risk was predicted, with strong offshore winds, known there as Santa Ana winds, gusting up to 65 mph in parts of Ventura and Los Angeles counties through Friday.

A brush fire known as the Tick Fire started in Los Angeles County on Oct. 24, spreading quickly and forcing thousands of residents to evacuate. (Reuters)

“The fuels and vegetation are critically dry. The expected weather will create an environment ripe for large and dangerous fire growth, especially Thursday and Friday,” the NWS forecast office in Los Angeles wrote.

True to the forecast, the Tick Fire started in Los Angeles County on Thursday afternoon and continued to grow quickly — and totally uncontained. Video from local media showed fire bearing down on a Canyon Country neighborhood, the flames moving steadily toward homes as residents fled.

Thursday’s raging fires, along with the Saddleridge blaze earlier this month and the Tenaja Fire in September, signal the onset of yet another dangerous wildfire season in California, where conflagrations of historic proportions have become commonplace.

The ongoing wildfires at both ends of the state come on the heels of the devastating 2017 and 2018 California fire seasons, which included the largest, most destructive, and deadliest blazes in state history.

It’s part of a clear pattern toward larger, more frequent and destructive blazes, as well as a longer-lasting fire season. And, according to CalFire, “climate change is considered a key driver of this trend.” Population growth and the increase in homes and businesses located near lands that typically burn are also escalating the risk of and damage from wildfires in the Golden State.

Last year, the Camp Fire devastated Paradise and killed 85 people, and the Woolsey Fire ravaged 100,000 acres north of Los Angeles and killed three. In 2017, the Tubbs Fire ripped through Santa Rosa — near where Kincade is burning — and killed 22 people.

By now, Californians have grown accustomed to the telltale signs of a fire in progress: the glowing red hills, the skies grayed out with smoke and ash, and the dire air quality warnings.

“This is the new normal that we live in,” David Hagele, mayor of Healdsburg, just south of Geyserville, told the San Francisco Chronicle. “It’s disheartening, and it’s scary for a lot of people because it does bring back a lot of scary memories from a couple of years ago.”

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