Unseasonably cold weather for late February will cause snow levels to fall to the lower elevations of the Cascade Foothills and Coast Range of southern Washington and northern Oregon by Wednesday morning. Moist onshore flow will combine with these cold temperatures to produce significant snow for the higher terrain beginning tonight. Snow showers will continue into Wednesday morning with lowering snow levels. More snow is expected later this week.
A Winter Weather Advisory in effect from 6 a.m. Tuesday to 6 a.m. Wednesday for the Coast Range of northern and central Oregon. Snow levels will reach around 1.500 feet tonight and lower to 500 to 1000 feet by Wednesday morning. Accumulation will be 4-8 inches about 1,500 feet. Watch for slick driving conditions.