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(KTXL) — A winter storm warning for the Sierra that brings heavy snowfall and rain to the region will last through Tuesday.

The snowfall began early Sunday morning.

FOX40’s Dennis Shanahan said the storm warning comes with the possibility of major travel delays and the falling snow leading to whiteout conditions sporadically over the next couple of days making mountain travel difficult to impossible at times.

Snow levels will start near 5,000 feet Saturday and will drop to 2,500-3,000 feet in elevation by Tuesday.  Donner Summit is expected to get six feet of snow in three days.

The rainfall forecast calls for 3-4 inches of rain in the Sacramento Valley, with 5-7 inches expected to fall in the foothills between Saturday and Tuesday.

The heaviest rain will come between Sunday and Monday nights.

Monday will be especially windy in the Sacramento Valley with gusts near 50 mph, which may cause trees and branches to fall, possibly resulting in power outages.