UPDATE 8:40 a.m. Wednesday:

I-80 has reopened in both directions to passenger vehicles only, according to Caltrans. R-2 chain controls from Colfax to the Nevada state line.

UPDATE: I-80 has reopened in both directions to passenger vehicles ONLY. R-2 chain controls from Colfax to the Nevada state line. https://t.co/oQw9uZADrd

— Caltrans District 3 (@CaltransDist3) November 27, 2019

UPDATE 7 a.m. Wednesday: Interstate 80 is currently closed to westbound traffic from Truckee to Nyack.

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Eastbound traffic on Intestate 80 from Colfax to the Nevada state line is under Requirement 2 chain controls, meaning chains or traction devices2 are required on all vehicles except four-wheel and all-wheel drive vehicles with snow-tread tires on all four wheels. Semi trucks are being turned at Applegate and at the Nevada state line due to traction issues going over the summit.

Good morning from Kingvale! Current highway closures noted below:
– I-80 WB from Truckee to Nyack
– SR-20 EB/WB from Nevada City to the 80 junction
– SR-49 NB/SB from Downieville to Sattley pic.twitter.com/57npRO1tOt

— Caltrans District 3 (@CaltransDist3) November 27, 2019

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Also in the Truckee-Tahoe area, chain controls are also in place on state routes 267, 28, and 89.

UPDATE 5:43 p.m. Tuesday: I-80 has reopened in both directions, according to a Facebook post from California Highway Patrol.

UPDATE 3:54 p.m. Tuesday: I-80 traffic is being turned at Alta and Truckee to clear the roads of collisions and keep traffic from backing up further, according to a tweet from Caltrans.

UPDATE: 2:45 p.m., Tuesday: California Highway Patrol is reporting multiple traffic collisions along Interstate 80 in the Truckee and Gold Run areas. Both eastbound and westbound traffic on I-80 between Alta and Truckee is currently being held due to the collisions. Chain control is in effect on I-80 between Alta and Truckee in both directions.

Donner Pass Road is experiencing gridlock and multiple spinouts, according to Truckee Police.

ORIGINAL STORY: A winter storm warning will go into effect at 4 p.m. for the greater Lake Tahoe area, and will last until 4 p.m. Thursday.

“Avoid travel if possible, you could be stuck in your vehicle for many hours,” said the National Weather Service office in Reno in its message. “If you must travel, prepare for long delays and carry tire chains, an emergency kit with extra food, water and proper clothing. If you stay home, have a backup plan in case of power outages.”

Up to 18 inches of snow is forecast to fall in the area, and up to 2 feet of snow could fall at above 7,000 feet.

Wind gusts as high as 60 mph may cause whiteout conditions during the storm.

Chain controls should be expected on Interstate 80 over Donner Summit, on U.S. Highway 50 over Echo Summit, and on other Sierra roads, according to the California Department of Transportation.

“Come prepared for winter travel in the Sierra! There will be chain controls! Chain are not sold by chain installers so bring appropriate traction devices with you and know how to install them,” said the department in a social media post. “Your tires should also have at least 6/32 tread depth for traction.”

Come prepared for winter travel in the Sierra! There will be chain controls! Chain are not sold by chain installers so bring appropriate traction devices with you and know how to install them. Your tires should also have at least 6/32 tread depth for traction. pic.twitter.com/MrhEWaIaHV

— Caltrans District 3 (@CaltransDist3) November 26, 2019

Highway closures due to safety concerns may also occur.

*This post will be updated