2:20 AM: We haven’t confirmed it yet but are checking into whether it was Guardian Two, the King County Sheriff’s Office‘s military-surplus second helicopter. That’s what the similarly loud, military-style helicopter passing by two weeks ago turned out to be, returning from a rescue in the South Sound, and a few hours ago, the KCSO Air Support Unit tweeted that G-2 was headed out to hoist an injured climber in Jefferson County. When on approach to Boeing Field, they fly low to stay out of Sea-Tac’s path, we were told. If we get confirmation, we’ll update.
11:04 AM: As noted in comments below, a followup tweet has added a little more information.
9:29 PM: And here’s what the rescue was all about.
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