Snow accumulation of 8 to 18 inches is possible in parts of the Cascades this weekend.

The eastbound lanes of I-90 just west of Snoqualmie Summit closed briefly Saturday morning due to snow that caused vehicle spinouts. The roadway was re-opened around 9 a.m., but more snow and winter weather are expected through the weekend.

A Winter Weather Advisory is in effect until 5 a.m. Sunday in the Cascades of Snohomish, and King counties.

Snow is expected above 4,000 feet with 1 to 5 inches of new snow. Drivers should plan on slick road conditions, especially over Stevens Pass.