A powerful atmospheric river had mostly moved through California after causing at least six deaths and dousing much of the state, but lingering thunderstorms brought the risk of mudslides in areas of Los Angeles County that were recently ravaged by wildfire. Flood advisories remain in place for LA, Ventura and Santa Barbara counties, where localized showers were still possible after heavy downpours on Saturday and Friday. Authorities on Sunday are still searching for a 5-year-old girl who was swept into the ocean by 15-foot waves at a state beach in Monterey County. The girl’s father was killed Friday while trying to save his daughter, sheriff’s officials say.