RENO, Nev. (AP) - A snowstorm lifted the spirits of skiers, but frustrated motorists on Sunday in the Lake Tahoe area.

Chains were required on all three major highways linking the Sacramento, Calif., and Tahoe areas: Interstate 80 over Donner Summit, U.S. 50 over Echo Summit and Highway 88 over Carson Pass.

Alpine Meadows ski resort just north of Tahoe reported up to a foot of snow from the weekend storm as of noon Sunday.

Nearby Squaw Valley reported more than 11 inches of new snow and Boreal atop Donner Summit reported 8 inches of new snow.

Boreal officials said the fresh snow has allowed them to open more terrain. The ski area has three lifts and four trails in operation.

The National Weather Service called for a chance of another 1 to 2 feet of snow in the northern Sierra through Tuesday afternoon.

Along the eastern Sierra, the weather service called for another 6 to 12 inches of snow over the same period.

A winte r storm warning was posted in the Reno-Tahoe area for a 24-hour period beginning at 4 p.m. today.

Before the weekend storm, the Sierra snowpack was only 2 percent of average for the date.

The Tahoe Basin's snowpack ended at about 85 percent of average last season, a second below-average year in a row.

Copyright 2008 The Associated Press.