From the Seattle Department of Transportation:
Street Maintenance crews worked throughout the night clearing up to six inches of wet snow and slush from major arterial streets around the city. This morning crews are clearing slush that remains on some arterial streets, especially at the tops of hills. Also, more than 30 SDOT employees are clearing street corners in high priority areas such as around hospitals and in business districts.
SDOT asks drivers to use caution when driving where there is still slush on the roadway making the streets slippery, and to be on the lookout for standing water. Residents and businesspersons are asked to check the drains near their homes and businesses to make sure the drains are not blocked by debris so that water can enter easily. Also, residents and businesspersons are encouraged to clear slush from the sidewalks around their property to enable pedestrians to pass by safely.