Authorities say search and rescue crews are looking for multiple backcountry skiers feared missing after a reported avalanche in Northern California as a powerful winter storm moves through the state. A spokeswoman for the Nevada County Sheriff’s Office said Tuesday an avalanche was reported in the Castle Peak area around 11:30 a.m. local time. The department said backcountry skiers were believed to be on the mountain. California is being walloped this week by a powerful winter storm carrying treacherous thunderstorms, high winds and heavy snow in mountain areas.