A flood advisory affecting 14 counties, including Pierce, has been extended until 6:30 p.m., according to the National Weather Service.
The advisory was initially set to expire at 10:30 a.m.
Forecasters said they are keeping flood watch through the day because another inch of rain is supposed to fall today, heightening the possibility of rivers and streams reaching their peaks.
County officials are keeping a close eye on the Puyallup River near Orting, which can sometimes spill over the banks during heavy showers.
Two inches have fallen in the last 24 hours, the Weather Service said.
Forecasters also warn that roads can be dangerous as water pools on the surface and urban flooding is a possibility as leaves and other debris clog drains.