Rainfall over the past couple of weeks has increased soil moisture to moderate levels across Western Washington. Heavy rainfall amounts of 0.5 to 2 inches in the interior lowlands and up one to three inches on the coast through this evening is expected to put extra pressure on soil instability, leading to an increased threat of landslides.
Landslides have already been reported in various locations in Western Washington including north of Hoodsport, which closed U.S. Highway 101 at milepost 330. Approximately 80 cubic 80 cubic yards of slide debris were removed from the highway. The slide occurred around 4 AM Saturday and 101 was reopened around 2:30 PM. As you see in the above picture, the slide hit a semi. No one was injured but more landslides are possible.
Areas most susceptible to landslides are steep coastal bluffs and steep hillsides.