A winter weather advisory is in effect from midnight tonight to 11 a.m. tomorrow for the I-5 corridor in Southwest Washington and the Willamette Valley.
The National Weather Service in Portland has issued a winter weather advisory for snow, which is in effect from midnight until 11 a.m.
Snow will begin to accumulate in some areas after midnight and mostly end Tuesday afternoon.
Snow levels around 1,000 feet early this evening and will lower to between sea level and 500 feet during the early morning hours Tuesday.
Snow will likely accumulate on the higher hills with amounts ranging from 1 to 3 inches.
Up to 1 inch is possible in heavier showers in the lower elevations.
Snow level will rise to 500 to 1,000 feet Tuesday afternoon.
The timing of coldest air and showers reaching the valley just before and during the morning commute could cause problems for motorists, especially in the hills.
A winter weather advisory for snow means that periods of snow will cause primarily travel difficulties. Be prepared for snow-covered roads and limited visibility, and use caution while driving.