https://www.nwrfc.noaa.gov/rfc/

The forecast is moving around a bit, well a lot maybe. This last few days have been a bit of a bust but it is five days out that the bump of any real consequence is to show. One plus inches with Olympics getting between one and two inches.

To use the link just click and the flows show when you place your cursor on a circle (stream). For projected rainfall look to the right side of your screen and click on 240 hours and the monitored sites show inches and cursor on that site breaks it down by days. The
10 day forecast https://www.nwrfc.noaa.gov/weather/10_day.cgi is defined as to the river flows so these two sites are the best to track weather / river flows.