Commercial structures in downtown Lower Lake and residences were in flames Sunday afternoon as the Clayton fire exploded, forcing thousands of people to flee homes and abandon businesses. By 5 p.m. flames had engulfed numerous commercial buildings in Lower Lake along Main Street, including the town’s post office, a tire store, a funeral home and restaurants, despite the combined efforts of firefighters, water tankers and helicopters. State Sen. Mike McGuire, who was on the fire lines Sunday with the Lake County Sheriff’s Office, saw the blaze burn down into Lower Lake on Sunday afternoon. “Lower Lake may be completely lost,”...