Warmer on Tuesday and Wednesday. Mostly cloudy on Thursday ahead of increasing chances for snow by Thursday night. Heavy snow is possible Friday night and again from Saturday night through Monday. Dry December 5-7 ahead of another chance for snow beginning around December 8.

The dry and calm weather will continue on Tuesday and Wednesday, and then a storm with two phases could bring snow to Colorado from Thursday to Monday. The first phase from Thursday to Saturday should favor the western and southern mountains, and the second phase from Saturday to Monday could favor the western and northern mountains.

Atmospheric river approaches the NW late this week overspreading the Rockies this weekend into next week. While AR events are usually associated with warm temps, there is a cold front that will keep snow levels very low during the initial phases. Deep snow is likely for the PNW and areas of the Rockies. Warm temps will raise snow levels late this weekend in the PNW and eventually the Rockies.

A storm will bring snow to the higher terrain of New England through early Monday, followed by additional snow showers across the Great Lakes and New England over the course of the week. The West will start out dry early this week, but the pattern will turn more active late this week with a few storms expected.