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Powder Alert - PNW To pick up 18 inches, Tetons to see a close to a foot this weekend

This post originally appeared on Powderchasers.

Forecast models are coming close to agreement for heavy mountain snow in the Cascades to transition east this weekend combining with very cold air from Canada bringing decent snows to the northern Rockies. Highlights will include most of the Cascades Friday PM through Sunday, north/central Idaho, western Montana, Wyoming, and isolated spots of northern Utah and Colorado. 

Short Term Forecast

Snow intensifies during the day in the northern Cascades (Baker) before transitioning south by afternoon into the central and southern regions of Washington. The highest amounts will be found near Mount Baker followed by areas around Stevens and Snowqualmie Pass later in the day or tonight. Crystal is my wildcard pick. It will be snowing at Crystal tonight, however it may not intensify until later Saturday/Sunday as heavier moisture moves in. Some spots of the northern Cascades of Washington will see an additional 12-18 inches through Sunday morning. Oregon gets into the action Saturday PM through Sunday, which will see the heaviest snowfall. It's possible that the heaviest moisture stays further north until the late Saturday/Sunday timeframe for the southern Cascades, so if you're chasing powder, move north to south this weekend.

Low pressure over the northern Rockies edging a cold front south Sunday morning. Photo: Courtesy of WeatherBELL

The Rockies earn respectable amounts in central Idaho, with the Northern Sawtooth ranges near Stanley seeing the highest amounts edging into Ketchum (Sun Valley) late Saturday night. Moderate amounts will be falling near Schweitzer especially into Sunday morning where 5-10 inches is likely. Montana compiles moderate amounts up north (Whitefish) with lighter amounts to the south (Big Sky-Bridger). Snow quality will be good with cold temps and lighter densities!

Moderate snow moves into the Tetons late Saturday that continues into Sunday night. Snowfall rates will be on the low side adding up slowly over a 24-30 hour period to around 5-12 inches through Monday morning. The best days to ride will be Sunday and Monday. The highest amounts will be found on the northern areas of Teton National Park. Jackson may be favored with SW flow Saturday night however winds edge more west/northwest Sunday favoring Targhee later in the period.

Models still have some discrepancy for Utah moving forward. It’s likely that Sunday PM through Monday nabs moderate snowfall (4-6 inches) for most of the Wasatch range (Including Park City),with heavier amounts downwind of the Great Salt Lake (Cottonwoods). Amounts near Alta could exceed 10 inches if everything pans out (wildcard). NW flow can either be your best friend and deliver unexpected dumps or skunk you, but it’s unlikely the skunk appears this weekend. Orographic snow showers continue into Monday morning in the higher terrain of the Wasatch with NW flow which will put the Cottonwoods in the double-digit range. Let it snow!

Colorado will get light to moderate leftovers in the northern mountains. I am still forecasting a wide area of 2-5 inches in most mountain locations along I-70 and north, while some light snow will be falling as far south as Telluride. Most snow will be falling late Sunday into Monday and higher amounts are likely near Steamboat where perhaps 5-10 inches falls (wildcard pick) as well as some isolated 3-7 inch amounts near the northern Divide (Winter Park). Vail can also benefit from NW flow orographics and the colder air so it's on my list for higher amounts if we are lucky.

Total snowfall through Monday night across the west. Photo: Courtesy of WeatherBELL

Extended Forecast

The extended pattern looks dry for at least December 9th in the West with a more active pattern setting up for the East. Thursday brings a warm system with rain/snow followed by all snow late in the storm period for New England. Models show a chance the ridge in the west will break down as we approach the middle of month but it's impossible to predict this far out. There may even be some systems that edge into Colorado around the 11th of December pushing a system through the eastern edge of the Rockies?

Thursday next week – High pressure in the west with low pressure in the east. Photo: Courtesy of WeatherBELL

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