A flood watch has been expanded to include Thurston County.
The National Weather Service said the flood watch is in effect through late Friday because of heavy rain in the Olympics and parts of the Cascades. Another inch or more is forecast for the Olympia area through late Friday.
Other counties affected by the flood watch include Lewis, Clallam, Grays Harbor and Whatcom.
The Skokomish River was above flood stage early Thursday and major flooding is possible, according to the weather service.
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Other rivers under the flood watch include the Nooksack, Chehalis, Newaukum, Bogachiel and Dungeness.