Nice recording, it's a Northern Pygmy-Owl, I made this recording a few years back up in the Blue's http://www.xeno-canto.org/291047 and heard one give the exact same call last week just above White River Campground in Mt Rainier. I'd guess it's some sort of territorial call but not sure.
From: <tweeters-bounces...> <tweeters-bounces...> on behalf of Ted Ryan <coffeemonkey101...>
Sent: Sunday, October 29, 2017 9:49:29 PM
Subject: [Tweeters] Owl vocalization?
I heard a bird last night off of Route 6 in Pacific County that sounds like a Saw-whet but Iíve never heard this particular sequence. Iíve linked to the video below. Any ideas?