SOUTH LAKE TAHOE, Calif. — Heavy snow fell in the Sierra Nevada as a winter storm packing powerful winds sent ski lift chairs swinging and closed mountain highways while downpours at lower elevations triggered flood watches Sunday across large swaths of California into Nevada.
More than 250 miles (400 km) of the Sierra from north of Reno south to Yosemite National Park remained under winter storm warnings either until late Sunday or early Monday.
The Heavenly ski resort at Lake Tahoe shut down some operations on Saturday when the brunt of the storm hit. The resort posted video of lift chairs swaying violently because of gusts that topped 100 mph (161 kph), along with a tweeted reminder that wind closures are “always for your safety.”
To the south, Mammoth Mountain reported that more than 20 inches (51 cm) of snow fell Saturday, with another 2 feet (.6 meters) possible on Sunday as the tail end of the system moves through the eastern Sierra.
The UC Berkeley Central Sierra Snow Lab reported Sunday morning that more than 43 inches (110 cm) had fallen in a 48-hour span.
A 70-mile (112-km) 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 in the mountains from Reno toward Sacramento.
A stretch of California Highway 89 also was closed due to heavy snow 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 (80 kph) that sent trees into homes in Sonoma County north of San Francisco on Saturday could reach 100 mph (160 kph) 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 (5 cm) in the Bay Area and up to 5 inches (13 cm) 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 said in a statement.
As the storm exits California and Nevada, it will push across the country and reach the Plains by mid-week, bringing significant rain and below-average temperatures, said Marc Chenard, meteorologist at the National Weather Service at the national center in College Park, Maryland.
“It will be a busy week while this system moves across the country,” Chenard said Sunday.
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