A Flood Watch remain in effect for much of Western Washington including Mason County as flooding caused by excessive rainfall continues to be possible through Friday afternoon.
According to forecasters, excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Storm drains and ditches may become clogged with debris. Area creeks and stream are running high and cold flood with more heavy rain.
An atmospheric river will continue to impact the area through much of the week and bring periods of moderate to heavy rain. Sharp rises are occurring on area rivers, especially those flowing off the Olympics and Cascades.
Urban and small stream flooding is possible for areas with poor drainage.
Saturated soils will bring increased potential for landslides and debris flows on burn scars.
Rainfall of 2 to 12 inches over the past several days has increased soil moisture to very high levels across Western Washington. This amount of rain will put extra pressure on soil instability, leading to an increased threat of landslides and debris flows, especially from recent burned areas.
Numerous landslides and debris flows have already been reported in the western Cascades. More landslides are possible.
Areas most susceptible to landslides under these conditions are steep coastal bluffs, other steep hillsides or road cuts, and recent burned areas. A diminishing threat of landslides and debris flows will continue for several days after the rain ends.