LOS ANGELES -- California residents evacuated neighborhoods below hillsides scarred by wildfires as the third - and largest - in the latest series of storms brought powerful rain Sunday and warnings about flash flooding and possible mudslides. The National Weather Service warned that the system was expected to gain strength throughout the day and could be the strongest in at least seven years. Flash flood watches and warnings were in effect for swaths of greater Los Angeles, where mountain areas could see more than 2 inches of rain. Authorities ordered evacuations near wildfire burn areas in Santa Barbara, Los Angeles...