I use the National Weather Service "current condition" which is part of the NOAA site.
http://weather.noaa.gov/weather/WA_cc_us.html

Gives you precip. totals for the past 3, 6 and 24 hours. Quillayute station (Forks area) for instance has received 2.42 inches the past 24 hours. The precip. data is only listed under the "current conditions" on the first pull down menu and click on the station you want. Also gives hourly rain status. Most are airport stations. I can hear the fish moving in now!