Thanks to everyone who responded. The overwhelming consensus was wolf, although there were other mammal suggestions including cougar, fox and human.

Plus, several visceral comments:

I would've been terrified to hear that.
I'd have a hard time sleeping after hearing that.
You're just lucky whatever that thing was didn't find you in your tent.
I'd be happy to be alive.

Looking forward to the next encounter!
Scott



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From: "Scott Ramos" <lsr at ramoslink.info>
Sent: Friday, July 1, 2022 7:32 PM
To: "Tweeters" <tweeters at u.washington.edu>
Subject: [Tweeters] unusual unidentified wail
While camping near Liberty a couple weeks ago, I was awakened close to midnight by a pair of Great Horned Owls dueting with their typical calls. Interspersed with their vocalizations was another call that I have never heard before. It took me a while to get my senses together and make a recording, still in my tent.

This audio has only two of the wails, but there were maybe a dozen that preceded these. I don't believe it is even a bird, even though it was happening during the owl conversation. None of my bird experts had any ideas, other than concern for my welfare!
https://www.inaturalist.org/observations/122222759

Any suggestions from our knowledgeable community?
Thanks,
Scott Ramos
Seattle