Mystery owl

We have an owl hanging around here, and I don’t know what species it is.

It’s a medium-large owl. At first I thought it was a short-eared owl, but the photos on Google images don’t match:

Nor does it appear to be a Northern Hawk Owl.

Typically these mystery owls are audible (in pairs) in late evening, all through the night, and into early morning. Notice the yellow eyes and black beak. They have a harsh screeching cry, unlike the melodious Great Horned Owl’s call. From my days as a field biologist, I’m very familiar with Great Grey owls, Barred owls, and Spotted owls, and know without question this isn’t any of those species.

Yesterday morning I caught some shots of the mystery owl. I was on maximum zoom and frequently taking photos through a screened window in very early morning light (meaning, dim), so the photos aren’t always clear or focused.

Below are the clearest shots I took. Any thoughts about the species?