NWS Forecast Office Seattle/Tacoma, WA

Significant snow accumulation is expected in the mountains, especially above 1500’ today/tonight. Travel across the mountains could be difficult at times. For the lowlands, cooler air arrives this evening as precipitation ends. Isolated areas could see a period of a rain/snow mix, especially in convergence zone activity in Snohomish & northern King counties, but accumulations are very unlikely due to warm ground temperatures. White areas on the map could see a rain snow mix but the chance of 1" of accumulation is less than 10%. Areas that see precipitation today/tonight may have temperatures at or below freezing Saturday morning, creating icy spots - especially on bridges & overpasses. Use caution! Some trouble spots we're monitoring...Minor snow accumulations (around or less than 1”) will be possible in some valley locations in the Cascades (e.g. Darrington, Skykomish, North Bend, and Packwood). Additional road locations such as SR 18 over Tiger Mountain Summit, US 101 west of Lake Crescent, and I-5 through the Chuckanuts could see some minor accumulation.