The Pacific Northwest is gearing up for a prolonged stretch of active weather, starting with heavy snow in the Cascades above 2,000 feet and valley rain lasting through Tuesday. By mid-week, an atmospheric river event will bring heightened risks of river flooding, urban flooding, and strong coastal winds. While southern Oregon and Northern California are expected to receive the heaviest rainfall through Wednesday night, the storm will shift northward, impacting NW Oregon and SW Washington later in the week. Forecasters predict significant rain totals, with some coastal areas receiving up to 6 inches. Flooding remains a concern, particularly in urban lowlands and along coastal rivers into the weekend.