Spokane, Washington – A more active storm track building across the Pacific Northwest ahead of St. Patrick’s Day could bring accumulating mountain snow and periods of valley rain or wet snow across Washington between March 11 and March 17.
According to the National Weather Service Climate Prediction Center, much of Washington falls within a 40-50% probability zone for above-normal precipitation during the 8-14 day period. Temperatures are projected to trend near seasonal averages statewide, meaning elevation and overnight cooling will determine precipitation type.
In Spokane and the Inland Northwest, daytime highs in the upper 30s and 40s may support rain at times, with wet snow mixing in overnight as temperatures dip toward freezing. Along Interstate 90 from Ritzville through Spokane and into the Idaho state line, bursts of heavier precipitation could briefly reduce visibility and create slick stretches, especially during pre-dawn hours.
Higher elevations, including Snoqualmie Pass, Stevens Pass and White Pass, are more likely to see steady accumulating snow with each passing system. Travelers crossing the Cascades should prepare for winter driving conditions at times, particularly overnight when pavement temperatures cool quickly.
Western Washington, including Seattle and Tacoma, is more likely to see mainly rain, though brief wet snow cannot be ruled out in higher hilltop communities if colder air deepens. Additional updates are expected as the March 11-17 window approaches and storm timing becomes clearer.
