10:02 AM: Thanks for the photo and tips! That’s the aircraft carrier USS Nimitz (CVN 68), northbound in Puget Sound. It’s been at Puget Sound Naval Shipyard in Bremerton for maintenance for the past year-plus. It’s homeported at Naval Base Kitsap. (Added: The Kitsap Sun says it’s out for training.)
12:44 PM: Thanks to everyone who has since sent photos of the submarine that headed out shortly after the Nimitz; the photo above is by Jim Borrow. While we’ve had occasional submarine sightings over the years, they’ve been more frequent lately.