Multiple river flood warnings have been issued across various counties in Washington State, including Snohomish, Skagit, Mason, Kittitas, King, Chelan, Yakima, Whatcom, and Benton. The National Weather Service (NWS) has issued these warnings due to anticipated heavy rainfall and rising river levels, which pose a significant threat to residents and infrastructure. The warnings vary in duration, with some extending into the weekend and others lasting until mid-next week, depending on the specific river basin and expected rainfall amounts.