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Laura Seitz, Deseret News
Maddy Brennan, 8, of Salt Lake City, takes a short break from sledding at Popperton Park in Salt Lake City on Thursday, Dec. 27, 2012.

SALT LAKE CITY — A winter storm that started Wednesday picked up again Thursday morning, providing a commuter special for those going to work.

Numerous slide-offs and slushy to snow-packed roads were reported around the valley. From midnight to 10 a.m., the Utah Highway Patrol recorded 46 accidents in Salt Lake County, with five of those involving minor injuries; 24 accidents in Davis County; and 19 accidents in Utah County, with four of those involving minor injuries.

Just after 7 a.m., the Utah Department of Transportation reported an accident involving two semitrailers had shut down all lanes of westbound I-80 in Parleys Canyon near the quarry. No one was seriously injured.

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About 6:20 a.m., another semitrailer jackknifed on southbound I-15 near 13200 South. Several lanes were blocked initially, causing slowing and backing in the area. A second jackknifed semi was reported about 30 minutes later on northbound I-15 at 2400 North.

Little Cottonwood Canyon was closed until 8:30 a.m. for avalanche control. Chains were required Thursday for trucks in Parleys Canyon, and chains or four-wheel drive were required for motorists on U.S. 189 in Utah County.

A winter weather advisory, issued by the National Weather Service, was expected to be lifted by Friday morning. The forecast calls for a 30 percent chance of snow Friday and some clouds through the weekend, with a slight chance of snow Sunday night.

Pat Reavy

Twitter: DNewsCrimeTeam