SEATTLE, WA — Frigid air settled in Puget Sound Sunday evening, bringing lowland snow to many towns and a hard freeze that is expected to last several days across Western Washington. Snowfall was especially pronounced in Snohomish County, where a convergence zone formed Sunday afternoon, allowing for higher-than-expected accumulation in some areas. The arctic front continued to drift southward overnight, and drivers should plan for slick roads during the Monday morning commute.
Forecasters said sub-freezing temperatures will continue through at least Wednesday, with a chance they could stretch even further into the week.
The two most likely times for widespread lowland snow were expected Sunday night and Wednesday afternoon. Tuesday is forecast to stay dry in most towns, with some lingering showers possible in areas south.
POTENTIAL SNOWFALL AMOUNTS
Sunday Night/Monday Morning:
Updated forecasts showed trace amounts to 2 inches of snow possible across the region, with the heaviest accumulations likely up north and across the convergence zone, where 2 to 4 inches could fall by Monday morning. Heavy snow is expected in all mountain passes.
The second storm is forecast to bring between 1 and 6 inches of snow across the Puget Sound lowlands, with the heaviest accumulations expected in the South Sound. More precise projections on the timing and geography of the snowfall will be available closer to mid-week.
NWS Seattle said most concentrated lowland snowfall should end early Monday, close to the morning commute, but temperatures will remain below freezing, allowing for potentially icy or snow-covered roads. Flurries may continue south of Snohomish County into Monday afternoon.
Fraser River outflow winds are expected to bring strong gusts across Whatcom County, with 50 to 60 mph winds possible around Bellingham. Power outages and tree damage are possible. Gusts elsewhere, in Everett, Seattle, and Tacoma are projected between 25 and 30 mph.
WINTER STORM ALERTS
A Winter Storm Watch was in place Sunday for portions of Snohomish, King and Pierce counties. A Winter Storm Warning is in effect for much of Whatcom, Skagit, and San Juan counties, as well as the mountains.
Heavy snow will lead to hazardous driving conditions and avalanche dangers in all mountain passes. Snoqualmie Pass, Stevens Pass and White Pass were forecast to receive up to 2 feet of new snow by late Monday afternoon.
Monday morning lows are forecast at 30 degrees for Seattle and Tacoma, and getting progressively colder up north. The Everett area will start the day in the mid-20s, and Bellingham is forecast in the mid-teens. Afternoon highs in most areas Monday could be just one or two degrees warmer than the lows. Tuesday is expected to be even cooler.