"Thursday through Friday night has the tightest model convergence on timing, intensity, snow levels, and wind impacts. Snow showers continue Thursday, then a weak frontal push Thursday night into Friday morning keeps light to moderate snowfall going across the Cascades, with best consistency in Washington and lighter totals farther south."
"From Sunday into Tuesday, guidance converges on a stronger storm cycle with colder air and longer-duration mountain snowfall. Timing agreement is best on precipitation ramping up Sunday, with snow levels dropping to near pass level Sunday night and then around 1,000 to 1,500 feet Monday morning during the coldest push."
"The larger Sunday-onward cycle should deliver much deeper accumulations but with lower confidence on exact timing and storm-to-storm splits. Expect denser snow first, then better quality as colder air settles in early next week, plus periodic upper-mountain wind that may affect exposed terrain."
A weak frontal system brings 1-7 inches of mostly dense snow through Friday night across the Cascades, with snow levels rising from 2,500-4,500 feet Thursday to 5,000-6,500 feet Friday, favoring wetter conditions at lower elevations. Snow quality features snow-to-liquid ratios of 6-12, with moderate winds of 20-35 mph on ridgelines. A stronger, colder storm system develops Sunday, with precipitation intensifying and snow levels dropping to pass level Sunday night and 1,000-1,500 feet Monday morning. This longer-duration cycle promises much deeper accumulations but carries lower confidence in exact timing and storm-to-storm precipitation splits. Denser snow initially transitions to better quality as colder air settles early next week, with periodic upper-mountain winds affecting exposed terrain.
#cascade-snow-forecast #winter-storm-system #snow-accumulation #weather-pattern-transition #mountain-snow-quality
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