As to Salmon only no Steelhead, it means a lot early in the season in the lower Chehalis. Chinook are the ones that stand out most as they will move hard on a big drop and the bigger the drop the more that come running. Coho not as much as they are little water spawners and flows drive them more but they will move out of the bay into tide and a little above on a good drop.

As in all things fish this is not true always but reasonably so. In a dry fall when you get that big drop on the front edge of a storm the Chinook pick up before the storm even shows. Wet year not as dramatic as they are already working their way up stream. Coho like the water to move in mass but if you get 4 inches of rain early then they will move with the same pattern.

Folks do not notice it as much as you would think as the nets take the surge right out of things. Oh yeah almost forgot, in this area East winds almost always come with a high barometer as fish not close to spawning tend to hold waiting for the signs of rain coming. ( unless your flows are way up all ready ) Does not effect the bite much ( salmon now ) but in tide water you have to go find them and not wait for them to come to you.