Multiple spinouts caused by slick conditions over Snoqualmie Pass forced the state to shut down I-90 in both directions for hours between North Bend and Ellensburg.
Snoqualmie Pass received up to 9 inches of new snow overnight.
The pass re-opened shortly before 11 a.m., according to the Washington State Department of Transportation.
Meanwhile, lowland areas are getting more rain and energy customers continue to deal with power outages.
Winds picked up over night, increasing along the Washington coast and areas north of Everett.
Wind gusts along the coast Monday evening peaked at 62 mph, according to data from the National Weather Service. The San Juan Islands were hit with peak winds between 50-60 mph.
The strong winds have knocked out power to several thousand people.
With all the rainfall, the National Weather Service is warning of an increased risk of flooding in several areas, primarily in southwest Washington and the Olympics.
WATCH: Latest forecast
A Winter Storm Warning in the Northern Cascades of Whatcom and Skagit counties is in effect until 6 p.m. Tuesday. Heavy snow with accumulations of up to 21 inches is expected for areas above 3,500 feet. Wind gusts could be as high as 60 mph at times, according to the NWS.
A Winter Weather Advisory is in effect for the Olympic mountains and Central Cascades. Snow is expected in the Olympic mountains for areas above 4,000 feet with wind gusts up to 65 mph, the NWS said. Between five and 10 inches of snow is expected at Hurricane Ridge.
Scattered showers will stick around for most of Tuesday. Totals from this system will be closer to an inch of rain across many locations by the time things begin to quiet down later in the day.
By Wednesday, things will have quieted down for a bit of a break in the action before the next storm arrives late Thursday. We might see another break later Friday into Saturday.