A Northwesterly flow off of the Pacific Ocean will continue moving little shortwave systems into Eastern Idaho and Western Wyoming, keeping snow in the forecast through the Christmas.

Tonight, heavy snow begins across the mountains with rain and snow showers throughout the Snake River Plain. Travel will become very hazardous over the mountain passes. Temperatures in the mid 30s. 

Sunday, Windy with more scattered rain and snow showers. Highs for the Snake River Plain into the lower 40's. Southwest wind 25 to 35 mph, with gusts as high as 45 mph. Chance of precipitation is 60%.

Monday, mostly cloudy with more rain and snow showers. Chance of precipitation is around 30%. Highs near 40° for the Snake River Plain.