The rain totals over the last 24 hr (ending 7AM Saturday) have been substantial, with some mountain locations getting over 4 inches (see map below which shows locations that received over 1.5 inches)
A number of major western WA rivers are surging now towards flood stage, as illustrated by the Snoqualmie near Carnation (below). And water worries for Seattle are rapidly disappearing as the Chester Morse and Tolt reservoirs go into rapid refill mode.
And there were strong winds with this event (see map of wind gusts over the past 24 h). Note particularly strong westerly winds on the eastern slopes of the Cascades as the flow accelerated down the lee slopes of the Cascades. Winds were gusting to 60-80 mph on exposed peaks in the Cascades.
The next surge of rain is moving in now, something well illustrated by the latest (7:15 AM) radar image
There is plenty for precipitation to come, as shown by the UW WRF forecast for the 72h period starting 5 AM this morning. You will notice the huge contrasts between the rain shadow region east of the Olympics, mountains of Vancouver Is, and Cascades and the windward sides of the barriers.
And there will be be the high-country snow....but that will be tomorrow's story....