As much as a foot of snow could fall in some locations, and roads could become icy, the National Weather Service said.

A winter storm watch was issued by the NWS Sacramento CA on Saturday at 4:58 a.m. valid from Monday 11 a.m. until Wednesday 5 p.m. for West Slope Northern Sierra Nevada.

La Niña has arrived, fueled by colder-than-normal Pacific Ocean temperatures—and it could bring a lot of snow and severe storms.

Officials are urging drivers to slow down, exercise caution and check state road condition websites before setting out.

High pressure remains in control today and Friday. Daytime highs will be in the low to mid-70s to close the work week. Winds will be breezy at times with gusts

A marine heat wave spanning much of the North Pacific Ocean is already influencing weather in North America and is poised to make its mark on winter. But forecasters have another global weather pattern to consider: La Niña.

In a winter weather advisory, the NWS said total snow accumulations between 5 and 10 inches would be possible for Alaska’s Atigun Pass, along with winds gusting as high as 55 miles per hour. The agency also cautioned that “very strong” wind and snow could result in visibility as low as one half mile at times.