(Undated) — Interstate 80, through the Sierra Mountains, remained shut down for the third consecutive day Sunday, as the winter storm blankets the region with heavy snowfall.

A major winter storm is expected to bring up to four more feet of snow to elevated areas by Wednesday. Residents are urged to stay indoors due to whiteout conditions, and authorities suggest travelers carry emergency kits.

The Sacramento Valley, including the Yuba-Sutter area, faces heavy rain and possible thunderstorms to start the week.