Semitrailers have jackknifed and cars are having trouble staying on the road, but no major accidents have been reported today as a major winter storm moves through the state.

But the snow, which hit hardest in parts of northern and southeastern Utah this morning, caused a number of road closures.

An avalanche closed U.S. 189 in Provo Canyon at about 9:30 a.m., said Trooper Cameron Roden of the Utah Highway Patrol. The road was still closed at 4:30 p.m. as crews worked to clear the snow. No vehicles were involved in the avalanche, Roden said.

Other road closures include:

• SR 92 near Highland, Alpine and American Fork Canyon

• U.S. 491 from Monticello into Colorado

• U.S. 191 from Monticello into Blanding, and near Vernal

The storm started late Saturday night in parts of the state. Alpine residents woke up to 7 inches of new snow, according to the National Weather Service in Salt Lake City.

The Ogden benches received a foot of new snow by 1 p.m. South Jordan was hit with 11 inches and Brigham City had more than 6 inches by 11 a.m.

Brighton reported 15 inches of new snow, while Snowbasin reported 10 new inches.

Forecasters at the Weather Service said the snow could continue through the night and into the morning, bringing another 1 to 3 inches.