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California's wine country contending with new wildfires

California firefighters battled destructive new wildfires in wine country north of San Francisco Monday as strong winds fanned flames in the already badly scorched state.

Shady, Glass and Boysen fires newly sparked in recent days in northern California

Flames from the so-called Glass Fire consume the Glass Mountain Inn, late Sunday in St. Helena, Calif. (Noah Berger/The Associated Press)

California firefighters battled destructive new wildfires in wine country north of San Francisco Monday as strong winds fanned flames in the already badly scorched state.

The new fires erupted Sunday in the famed Napa-Sonoma wine region and in far northern California's Shasta County, forcing hasty evacuations of neighbourhoods.

In wine country, flames engulfed the distinctive Chateau Boswell Winery north of St. Helena, The Black Rock Inn in the small community of St. Helena and multiple homes in the city of Santa Rosa, the San Francisco Chronicle reported. Residents of a seniors' home were among those evacuated.

The Adventist Health St. Helena hospital suspended care and transferred all patients elsewhere, according to a statement on its website.

The wine country blaze had burned 44 square kilometres as of early Monday, according to the California Department of Forestry and Fire Protection, or Cal Fire.

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Evacuations were also ordered in Shasta County as that fire spread.

The causes of both new fires were under investigation.

During the weekend, the Pacific Gas & Electric utility turned off electricity to targeted areas where the winds raised the potential for arcing or other power equipment damage that could spark new fires.

PG&E, the nation's largest electric utility, is operating 28 community resource centres from 8 a.m. to 10 p.m. while power is out. As of Sunday evening, the centres had received about 1,200 visitors, a spokesperson said.

Residents of the Oakmont Gardens seniors' home leave the area in an evacuation in Santa Rosa, Calif., prompted by the so-called Shady Fire. (Noah Berger/The Associated Press)

The company continues to monitor weather conditions in concert with federal agencies including the National Weather Service and the National Oceanic and Atmospheric Administration.

Warnings also for 2 southern counties

Fire-weary California is facing a new siege of hot, dry weather with potentially strong winds that could cause power lines to arc and spark new blazes in parched vegetation that's ready to burn.

Red Flag warnings for extreme fire weather conditions were issued for the northern and central areas of the state from late Saturday to Monday, the National Weather Service said. Similar warnings were in place for parts of Southern California's San Bernardino and Riverside counties on Monday.

The Shady Fire is shown early Monday as it approaches homes in Santa Rosa, Calif. (Samul Corum/AFP/Getty Images)

So far this year, more than 8,100 California wildfires have scorched 14,970 square kilometres, destroyed more than 7,000 buildings and killed 26 people.

Most of the loss has occurred since a frenzy of dry lightning strikes in mid-August ignited a massive outbreak of fires. The causes of other fires remain under investigation, and authorities said one was caused by a pyrotechnic device at a gender reveal event.

On Sunday, wind drove smoke from the new Napa County fire toward Sonoma and Marin counties, worsening the air quality, said Gerry Diaz, a meteorologist with the National Weather Service.

"We just have smoke on all fronts, unfortunately," Diaz said.

Numerous studies in recent years have linked bigger wildfires in America to global warming from the burning of coal, oil and gas, especially because climate change has made California much drier.