7 p.m. update
Chain controls are moving down the hill. Now down to near Placerville on HWY 50 and near Colfax on I-80.
Up to 46 inches of additional snow is possible through Saturday.
On and off light rain for the rest of the night in the valley.
6 p.m. update
An Avalanche Warning has been issued for the Sierra through Saturday morning due to dangerous conditions.
4 p.m. update
Occasional moderate rain will continue to fall in the valley through tonight with a slight chance of thunderstorms.
A Winter Storm Warning is in effect for the higher Sierra elevations through 10 a.m. Saturday and lower elevations through 10 p.m
Additional snow accumulations from 9-13 inches but some locations will get nearly 46 inches of new snow through late Saturday.
Travel through the Sierra will be slow with chain controls.
The valley will continue to see a risk of thunderstorms Saturday with on and off showers.
11 a.m. update
A blizzard warning has expired but the National Weather Service says whiteout conditions are still possible around Lake Tahoe where 3 feet of snow (90 centimeters) already has fallen and winds gusting to nearly 150 mph (240 kph) shut down Interstate 80. A winter storm warning remains in effect until 10 a.m. Saturday around Tahoe where up to another 20 inches (50 cm) of snow is possible.
Four feet (120 cm) already has fallen at Mammoth Mountain south of Yosemite National Park. A 146 mph (235 kph) gust of wind was recorded Thursday night atop Squaw Valley resort on the north end of Tahoe.
Three feet (90 cm) of snow was measured at the Mount Rose ski resort near Reno.
I-80 reopened Friday morning but chains or snow tires are required west of the California-Nevada line. School was canceled throughout the Reno-Tahoe area and state offices are closed.
A blizzard warning is still in effect for parts of the Sierra Nevada, where winds could gust up to 125 mph (200 kph) on ridges and 60 mph (95 kph) in some valleys, the National Weather Service said.
The cold front is expected to bring snow to foothill areas as low as 3,500 feet (1,066 meters), and officials warned people to stay off mountain roads. Chains or snow tires were needed on stretches of Interstate 80, U.S. 50 and U.S. 395. From the Sierra Avalanche Center in Truckee, there is still a back county Avalanche Warning until 7 a.m.
As much as 5 feet (1.5 meters) of new snow is possible in the upper elevations of the Sierra around Tahoe, where more than a foot (30 centimeters) fell Thursday. The snow will help the Sierra snowpack, which is vital to the state's water supply and is only about a quarter of its normal depth for this time of winter.
Stephanie Myers, a spokeswoman for Heavenly Mountain Resort and Kirkwood Mountain Resort in Lake Tahoe, estimated snow was falling at about 2 inches (5 centimeters) an hour.
"We're thrilled about this storm," Myers said. "Once the storm moves out of the area, we'll have a beautiful bluebird powder day."
Valley: Isolated showers and thunderstorms, otherwise mostly cloudy skies. Highs in the lower 50s. Not as windy as yesterday, but could be breezy at times.
Foothills: Scattered showers and snow showers. Travel to the Sierra could be held in the foothills because of hazardous driving conditions.
Sierra: Winter storm warning. Periods of moderate to heavy snow at times and could cause limited visibility. Driving in these conditions are dangerous.