Wildfires have cropped up in different regions across California over the past several days as a record-breaking heat wave blankets most of the state, with more fire activity expected amid a spate of dry lightning and thunderstorms.

A fast-spreading wildfire in California's wine country prompted mandatory evacuation orders as firefighters continued to battle the blaze from the ground and air into Monday. The Pickett Fire in Northern California's Napa County has burned some 6,