SAN FRANCISCO — A powerful storm barreled toward Southern California after flooding highways, toppling trees and causing mud flows in areas burned bare by recent fires across the northern part of the state.Northern California 24-hour precipitation map is...a thing. 9+ inches in places.Drenching showers and strong winds accompanied the weekend's arrival of an atmospheric river — a long and wide plume of moisture pulled in from the Pacific Ocean. The National Weather Service's Sacramento office warned of "potentially historic rain."
