Reminds me of the Chehalis River Valley in '07.

well we did get 2.5 inches in less than 30 min

The hills and (minor) mountains SW of Chehalis got something like 12 inches overnight during the 2007 "Pineapple Express" over the first weekend of Dec. https://en.wikipedia.org/wiki/Great.....l_Gale_of_2007 , https://www.google.com/search?q=2007+chehalis+flood&ie=utf-8&oe=utf-8 https://www.google.com/search?q=2007+chehalis+flood&tbm=isch&tbo=u&source=univ&sa=X&ei=FXyKVZi5DcHxoATWzYC4Bw&ved=0CB4QsAQ&biw=1920&bih=922#imgrc=_
Lots of little landslides and suddenly the Chehalis and her immediate tributaries were acting like flash flood prone desert washes.