These photos were taken Sunday 2/28/10. The first photo was at approx. 1:50pm looking south towards Seattle, WA. The second photo was taken about 3:30pm - 23 miles West of the first one - looking North.
From what I could gather - these clouds are called fallstreak, holepunch and/or punchhole clouds. Not much info on them other than they are considered rare. I have lived here over 20 years and my husband has lived here since 1976. Neither of us has ever seen anything like this before.
El
PS - weather was mid 50's (f), party sunny, slight breeze - nothing unusual.