Well, one thing a forecaster learns quckly is humility. There is a weak upper level disturbances that is causing this light precipitation. The heaviest precipitation is on the eastern side of the Sound. Take a look at the radar animation to see the details ( http://www.atmos.washington.edu/~ovens/loops/wxloop.cgi?atx_n0r+/2h/ ). The models did not handle this light precipitation well...in most of the region there is no accumulation...but some of you are getting up to around an inch (Woodinville and Snohomish seem to be ground zero for the worst). It WILL end later this afternoon and early evening....guaranteed.
Light precipitation is a clear weakness of our current models...working on this issue is definitely on my to-do list....cliff