One home was damaged and another building lost as three wildfires burned around the area Wednesday morning, including one blaze that charred about 125 acres in the Knights Valley area of Sonoma County northwest of Calistoga, officials said.

About 280 firefighters were divided between three three events, two of them in Napa County and the largest across the Sonoma County line

The so-called Yellow Fire -- originally two fires that burned together near Highway 128 and Yellow Jacket Ranch Road - ignited shortly before 2 a.m. near a rural home occupied by Nick and Holly Triglia, about a third of which was eventually damaged by flames, Cal Fire spokeswoman Suzy Blankenship said.

Another building - it was unclear what type - was destroyed by a second fire off Silverado Road and the Oakville Road crossing near Yountville in Napa County, she said. That fire had burned about 76 acres and 60 percent contained, Blankenship said.

About 150 fire personnel from around the area were battling the Yellow Fire in grassy woodland, brush and timber, she said.

They had the fire 50 percent contained by 9 a.m., with full containment projected at 8 a.m. Thursday, she said.

"They're making good progress," Blankenship said. "They've got winds of 10-to-20 miles (per hour) out there this morning, with the northern winds, but they have made great progress."


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A smaller, 2-acre also was burning on Schramsberg Road just south of Calistoga near Schramsberg Vineyards, Cal Fire said.

But it was burning in heavy fuels in terrain hard to access, providing challenges to more than 45 firefighters working there, Blankenship said.

Authorities were investigating the fires, and no cause was immediately known, though weather and fire personnel have warned of the impact of unseasonably warm, dry, windy conditions.

A red flag warning is in effect until at least 6 p.m. Wednesday, and authorities are urging caution in handling potentially combustible materials or machines.

Gusty overnight winds had caused numerous power outages around the area and brought down live power lines across Chalk Hill Road east of Healdsburg, causing a small vegetation fire there Wednesday morning.

Fire officials have sounded the alarm for the past week about dire expectations as the fire season gets under way, thanks to an exceptionally dry spring.

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