As much as 13 inches on the coast, with many locations getting 5-8 inches. But less than a quarter of an inch in the rain shadow over parts of Puget Sound and NW Washington. Big totals (4-6 inches) along the western slopes of the Cascades. And a very high freezing level that is melting lots of the recent snow
Some large rain totals so far and amazing rain shadowing. Here are the 24h totals ending 11 PM Sunday. Notice how the heaviest amounts are in the foothills and just upstream of the terrain, where the air is initially forced to rise. 7.65 and 6.15 inches just upstream (SW) of the Olympics. 2-4 inches along the lower western slopes of the Cascades.
But ONLY .01 inch at one location on southern Whidbey Island in the rainshadow. Amazing
It is hardly raining in Seattle, while biblical rain is hitting the mountain slopes. Take a look at the latest radar...the profound rain shadow over Seattle is starkly apparent.
The 4 PM sounding at Quillayute (Forks) on the Washington coast shows the strong westerly winds aloft and the extremely warm, moist flow. The freezing level is now 10,000 ft and heavy rain is falling in the mountains (the height on this plot is in terms of pressure, 700 is roughly 10,000 ft; red is temperature, blue is dew point. Where they are on top of each other the air is saturated).
The National Weather Service has flooding warning for a number of rivers.