...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 10 PM PST SUNDAY... * WHAT...Snow expected. Total snow accumulations of one to three inches. * WHERE...In Oregon, Upper Hood River Valley and Central Columbia River Gorge. In Washington, Central Columbia River Gorge. * WHEN...From 4 AM to 10 PM PST Sunday. * IMPACTS...Plan on slippery road conditions.