Winds could fan already enormous Northern California fires

Ben Slaughter, a firefighter for the Boulder Creek Fire Department, walks along Highway 9 while monitoring flames from the CZU August Lightning Complex Fire, Saturday, Aug. 22, 2020, in Boulder Creek, Calif. (AP Photo/Marcio Jose Sanchez)

SAN FRANCISCO — A calm overnight allowed firefighters to make progress against a trio of massive wildfires burning in Northern California but they were girding for a weather system Sunday that will bring high winds and thunderstorms that could spark new fires and fan existing blazes that destroyed nearly 1,000 homes and other structures and forced tens of thousands to evacuate.