Forecast By SnowBrains Meteorologist – Eric McNamee
9:30 AM MST, Nov. 19, 2020
An unsettled weather pattern will bring 1-2 Feet of snow through the weekend.
Resorts likely to get the most snow are Mount Baker, Crystal Mountain, and Stevens Pass.
Active weather looks to continue as a progressive pattern will persist into next week.
1-2 Feet of snow is expected to fall in the Cascades through the weekend as unsettled weather continues.
A series of weak disturbances will move through the region, allowing for snowfall through the weekend.
This will come in waves so snowfall will not be continuous, but will be heavy at times.
Cold temperatures aloft within these shortwave impulses will contribute to the development of some lightning flashes and convective activity through the early evening hours. Per the SPC HREF analysis, most instability parameters appear to peak in the early afternoon, lasting through early evening today. Breaks in shower activity are needed in order to increase surface based instability for moderate gains in CAPE. Additionally, 0-1km Storm Relative Helicity is at its maximum within the same time frame. A GFS model sounding for Puget Sound generally matches with this analysis. The potential for brief heavy rain and small hail is there for any cells that develop. Precipitation on Friday will likely be more scattered in nature, with the wettest period confined to the morning hours. Snow levels will drop below 4000 feet Friday morning, therefore the passes could pick up a couple more inches. If travel plans involve the Cascade passes, be prepared for winter driving conditions. A drying trend establishes itself over the area as a shortwave ridge takes over for Saturday and much of Sunday morning. -NWS Seattle 11/19/2020
More robust systems look to move into the Pacific Northwest next week.
At this time, exact snowfall amounts are not certain but additional feet of snow is likely.
Wednesday and Beyond:
Global models and ensemble indicate active weather is likely in the extended period.
This will likely bring above-average precipitation and relatively average temperatures.