SOUTH LAKE TAHOE, Calif.-- Heavy snow fell in the Sierra Nevada as a winter storm packing powerful winds left ski lift chairs swinging and mountain highways closed while downpours at lower elevations triggered flood watches Sunday across large swaths of California into Nevada.
More than 250 miles of the Sierra from north of Reno south to Yosemite National Park remained under winter storm warnings until late Sunday or early Monday.
The Heavenly ski resort at Lake Tahoe shut down some operations when the brunt of the storm hit Saturday. The resort posted video of lift chairs swaying violently in gusts that topped 100 mph and tweeted a reminder that wind closures are "always for your safety."
To the south, Mammoth Mountain reported that more than 20 inches of snow fell Saturday, with another 2 feet possible as the tail end of the system moved through the eastern Sierra.
The UC Berkeley Central Sierra Snow Lab in Soda Springs, California, reported Sunday morning that more than 43 inches had fallen in a 48-hour span.
A 70-mile stretch of eastbound U.S. Interstate 80 was closed Saturday "due to zero visibility" from the northern California town of Colfax to the Nevada state line, transportation officials said. Chains were required on much of the rest of I-80 and other routes in the mountains from Reno toward Sacramento.
Many other key roads were closed because of heavy snow, including a stretch of California Highway 89 between Tahoe City and South Lake Tahoe, the highway patrol said.
The U.S. Forest Service issued an avalanche warning for the backcountry in the mountains west of Lake Tahoe where it said "several feet of new snow and strong winds will result in dangerous avalanche conditions."
Gusts up to 50 mph that sent trees into homes in Sonoma County north of San Francisco on Saturday could reach 100 mph over Sierra ridgetops on Sunday, the National Weather Service said.
Heavy rain was forecast through the weekend from San Francisco to the Sierra crest with up to 2 inches in the Bay Area and up to 5 inches at Grass Valley northeast of Sacramento.
Warnings and watches were also up across Southern California, as heavy rain caused localized flooding in greater Los Angeles.
"Significant travel delays possible with accumulating snow on several mountain roads. This could include the Tejon Pass and Grapevine area of Interstate 5," the National Weather Service's LA-area office said in a statement.