Elsewhere, more than 148,000 customers lost power in MI following days of freezing rain.
Gov. Jay Inslee declared a state of emergency, saying everyone in the state should focus on staying safe.
From Sunday night to Monday morning, the snow and wintry mix will spread eastward and threaten slick travel across the mid-Atlantic, including around Baltimore, Philadelphia and New York City.
The region, more used to rain than extreme wintry conditions, has been hit by a series of wintry storm systems.
An unusually powerful winter storm dropped over six inches on the Pacific Northwest city February 9 - a "new daily record" according to the National Weather Service, which also happens to report that more snow is on the way.
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Around 180 people spent the night in an emergency shelter set up in Seattle Center and officials on Saturday went out to get homeless residents to safety.
The Pacific Northwest snowstorm also left almost 50,000 people in eastern Washington without electricity. A 59-year-old man died Thursday from exposure to frigid temperatures at a Seattle light rail station. Hundreds of people in Tacoma turned out for a snowball fight in a park after someone suggested it on Facebook.
Residents in Seattle cleared out grocery store shelves and left work early on Friday afternoon as the storm arrived. She grew up in southern OR, where snow is more common, and wasn't fazed by the forecast.
Sang said she had never seen the store so crowded. It's like, 'Use your brain! As the low pressure pulls away to the east Tuesday, northwest winds will strengthen gusting over 35 miles per hour and snow will gradually end from west to east later Tuesday/Tuesday evening. But most of the heavy snowfall was expected to end by Sunday morning, the Reno Gazette-Journal reported.
Schools and colleges had canceled classes ahead of the storm expected to bring 6 to 8 inches (15 to 20 centimeters) of snow.