The National Weather Service in Seattle has issued a warning for potential river flooding in King, Snohomish, and Skagit counties due to heavy rain from an incoming atmospheric river. Flood conditions are possible from Sunday night through Tuesday morning. Mountain areas could receive 3 to 6 inches of rain, with snow levels rising to 7,500 feet, according to the National Weather Service.

Seattle residents are in for a relentlessly wet week, with the forecast showing no signs of easing. Humidity is at 93%, visibility remains at 3 miles despite the heavy rain, and gusting winds could reach 32 mph today. The National Weather Service reports a "Chance of precipitation is 100%," with rain totals between a tenth and quarter of an inch. Temperatures will hover around 54°F tonight as the rain continues steadily. The wet weather is expected to persist through Monday, with slightly calmer winds and lighter daily precipitation under a tenth of an inch, but the "Chance of precipitation is 100%" remains through Tuesday.

Monday night will bring less than a tenth of an inch of rain before temperatures peak at 67°F Tuesday, then drop to around 50°F at night. Showers will intensify into thunderstorms by Wednesday afternoon, with heavier rain expected before 11 p.m., followed by continued showers. Rain will persist through the week, and residents in flood-prone areas should stay updated on local news and prepare for possible evacuations if river levels rise. For the latest forecasts, visit the National Weather Service's website.