When I first saw this bird, I swore to my husband that it was an owl. Of course, an instant later I knew it was a hawk and not an owl. A view of the hawk in profile revealed an extremely long tail, at which point I knew it was a Northern Harrier.
It was an understandable mistake to confuse this hawk with an owl because Northern Harriers have facial disks like most owls do.
A Merlin and a Northern Harrier in one weekend is A-OK with me!