Rockies: Moisture will begin in the Tetons as early as Friday morning (Light snow) and continue through Saturday night. The peak snowfall will occur early Saturday morning with a sharp cold front and continue through the day. The long duration event and peak snowfall on Saturday should lead to storm totals in the 10-18 inch range with higher amounts in Northern areas of Yellowstone. NW flow is not ideal for Jackson Hole and a better bet for Teton Pass and perhapsTarghee. Plan on storm skiing the annual tram opening at Jackson on Saturday morning where top to bottom riding opens for the season. The Northern Wasatch of Utah will see steady light to moderate snow on Saturday/Sunday (Peak Late Saturday-into the evening) with storm totals in the 8-15 inch range. Little Cottonwood Canyon will be favored under NW flow (Alta, Snowbird). Both Central and Southern Montana (Bozeman, Bridger) will also see decent snowfall (7-11) primarily on Saturday.
Colorado: I highlighted Colorado in red on the alert for a few reasons. First, it might be the first snow that many resorts have seen in 4 weeks, and 2nd with cold air alone (This system has a weak moisture tap), things can get cranking especially over Steamboat and perhaps the Gore Range near Vail. As very cold air settles in on Saturday/Sunday you stand the best odds of a moderate 5-10 inch dump with some areas picking up greater amounts (Steamboat has the best odds). I-70 will be snow covered by Saturday evening. Aspen, and areas south to Telluride will also see snow later Saturday (4-8) and by Sunday the flow favors the front range so expect Winter Park, Summit County. and Eldora to get into the action. My experience in Colorado tells me that cold fronts can sometimes work magic for snowfall from orographics (Cold air forcing warmer air aloft). Light snow will break out over Colorado prior to the strong cold front on Saturday PM so expect 1-3 inches prior to the main event.
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Friday- Pacific Northwest, Baker AM, Stevens PM
Saturday- Tetons, Northern Idaho, Bozeman (Storm skiing)
Monday-Left overs on the front range of Colorado- Eldora?