Whistling, buzzing noise in 2003 Subaru Outback

Occasionally there’s a loud, whistling, buzzing noise that sounds like it’s coming from the passenger-side window. It’s like the noise you get when you blow through a tissue-covered comb, but louder and intermittent. It’s usually when I’m going faster than 55 mph and seems to have no pattern; it eventually stops. Any ideas?

Roof rack? does the door seal tight? Sometimes a customers ideas about a objectional noise can throw you off target.Get someone to ride back there for better identification of the source.

Possible loose or damaged weather stripping around the window or door.