Looking at the forecast it has changed a bit and todays update is posted. So take a look https://www.nwrfc.noaa.gov/weather/10_day.cgi and looking to the flows and 240 hr forecast at https://www.nwrfc.noaa.gov/rfc/ . ( you need to hit the precipitation 240 hour tab bottom right side of your screen) The upper Olympics are supposed to get over 4 inches with Wynoochee Dam 4.66 inches. The farther South we go the total decreases with the upper Chehalis being 2.5 inches or so.

Bottom line is the Olympic streams are going brown but peak and drop back down until the next round of rain. Flows on the Satsop are projected to go from around 400 cfs to around 2300 cfs. The Chehalis at Porter is looking for a jump from around 400 cfs to to 2200 cfs. With the upper Chehalis water taking a couple more days to reach Elma we are looking at the Satsop up then down and clearing but the upper Chehalis water arriving and if muddy it is likely keep the Chehalis brown out going.

Several days out the forecast is good for fish not so much for fishing.