Forecast By SnowBrains Meteorologist – Eric McNamee
11:35 AM MST, Nov. 25, 2020
A shortwave trough will bring 8-12″ of snow to the Cascades into Thanksgiving.
Resorts likely to get the most snow are Mount Baker, Crystal Mountain, and Stevens Pass.
An additional 3-6″ of snow will fall in the northern Cascades on Saturday, then there will be a break in the action early next week.
A shortwave trough that is currently over the Pacific Northwest will bring 8-12″ of snow through Thanksgiving.
Cold and unstable northwest flow will keep showers going through the remainder of Wednesday and early Thursday.
Conditions will briefly dry out through the day Friday before another system moves through Friday night into Saturday.
This will drop an additional 3-6″ of snow in the Cascades along the Washington-Canada border.
Today through Friday night...The cold front that brought an initial stronger shot of precipitation to the area has since moved inland leaving behind a move convective environment it it`s wake. While the frontal precipitation and breezy winds have passed, showers remain bringing periods of more intense rain and snow showers to the Cascades. Snow levels are dropping as cooler air pools in behind the cold front. Snow levels have lowered down to around 3500 ft with temperatures at 5000 ft around -3 degrees celsius. With the lowered snow levels and persisting rain, can expect another several inches of snow, especially above 5000 ft. As previously mentioned, there is some lingering convection behind the front which may produce some isolated weak thunderstorms along the coast line. Overnight into Thursday, the remaining showers will dissipate as high pressure over the Pacific builds. This ridge aloft stretches north across British Columbia, while near the surface it is slightly flatter. Because of the less amplified surface feature, winds will generally remain fairly week and offshore. Expecting clearing skies and dry conditions Thursday through Friday. With the clearing skies and winds becoming light in the evenings, there is a strong chance for fog development in many locations below 1000 ft. Fog likely will become dense at times in more prone areas around the southern Willamette Valley and backing up to the Coast Range foothills. -NWS Portland 11/25/2020
Conditions will clear out Sunday and Monday before another system affects the southern Cascades.
Snowfall amounts are not certain at this time but some snow is expected.
Conditions look to clear out heading into the extended forecast.
Tuesday and Beyond:
As mentioned above, conditions will clear out in the extended as high pressure builds over the Pacific Northwest.
This will bring above-average temperatures and below-average precipitation to the region 6-10 days out.