At least nine Lake Tahoe ski resorts closed and visitors to Yosemite National Park were told to urgently leave Friday as California's most powerful storm of the season bore down on the Sierra Nevada, where residents were urged to take shelter as they prepared for up to 10 feet of snow in some areas. The storm began barreling into the region on Thursday, with the biggest effects expected to close major highways and trigger power outages into Saturday. A blizzard warning through Sunday morning covers a 300-mile stretch from north of Lake Tahoe to south of Yosemite National Park, per the AP.