I hear the same thing in my 'Tour. IMO, it's coming from the sides of the windshield. If you look outside at the sides of the windshield, you'll notice that the trim is indented where the glass goes under it. Once when it was cold and snowy, I packed some snow in there to make it taper from the windshield surface to the top of the trim and the noise went away. I've been thinking of filling that area with something to make it have that taper, but I can't decide what to use. I don't want it to look crappy. My .02 worth.
