Albatrosses
Albatrosses stay fairly close to the ocean surface. Speaking as a sailor, I can assure you that what the wind is doing at the top of a 20m (60 ft) mast is often very different from what it is doing at deck level. With wave heights on the open ocean being 5m and up (they don't usually feel so big because they are not steep) it wouldn't surprise me a bit to have a lot of vertical movement of air in the space from sea level to, say, 20 or 30 meters up.