Powerful winds didn’t materialize early Friday, allowing fire crews a chance to make gains. But winds up to 30 mph (48 kph) were forecast to push through the hills of Napa and Sonoma counties as the Glass Fire, which exploded in size earlier in the week, threatens more than 28,000 homes and other buildings.
“So far we have not seen the velocity of the winds that we were expecting,” Cal Fire Battalion Chief Mark Brunton said. “But there will be gusts and ... we do have hot embers and it won’t take much to take that and blow it into a very dry receptive fuel bed. That gives us cause for concern.”
Winds were blowing at higher elevations on the western side of the fire. Crews expected a long battle to keep flames from jumping containment lines and to prevent spot fires from leaping ahead to spark new blazes.
More crews and equipment were deployed in and around Calistoga, a town of 5,000 people known for hot springs, mud baths and wineries in the hills of Napa County about 70 miles (110 kilometers) north of San Francisco.
The area was also experiencing high temperatures and thick smoke that fouled the air throughout the San Francisco Bay Area.
Numerous studies have linked bigger wildfires in America to climate change from the burning of coal, oil and gas.
Scientists say climate change has made California much drier, meaning trees and other plants are more flammable.
About 80,000 people were under evacuation orders and officials warned that more were possible. Fire and public safety officials asked people to remain vigilant, stay out of evacuation zones and quit demanding that officers let them back into off-limits neighborhoods.