A series of powerful storm systems is set to bring wet and stormy weather to the Pacific Northwest, starting Saturday. Light valley rain and heavy Cascade snow are expected this weekend, with a Winter Storm Warning in effect for Cascade passes due to significant snowfall. Travelers should prepare for hazardous conditions as snow levels drop to 2,500 feet Sunday evening.
The bigger concern looms next week as a prolonged atmospheric river develops from Tuesday to Friday. This system could deliver heavy rain, urban flooding, landslides, and potential river flooding. While forecast confidence is low, impacts could range from minor to severe depending on rainfall intensity.