An arctic cold front slowly moving south from British Columbia set the stage for a weather system that will leave lingering snow chances into Monday morning. A new system arriving Tuesday has already triggered a Winter Storm Watch in the mountains and could also lead to lowland snow accumulations throughout western Washington. Snow arrived Sunday afternoon with reports of snow and mixed rain and snow and rain near the King County/Snohomish County border and reports of snow later in the day around Seattle. Heavy snow on the mountain passes contributed to the closure of westbound Interstate 90 for hours at Ellensburg on Sunday following a semi-truck crash. Chains are required going both directions. Traction tires are required on both Stevens and White Passes. Heavy mountain snow is also forecasted for later in the week. Read the full story here; https://www.king5.com/article/weather/weather-blog/lowland-snow-forecast-sunday-upcoming-week/281-46a56890-9111-481b-b7b4-31ff05dabe4b