http://www.slate.com/blogs/bad_astronomy/2013/04/12/atmospheric_vortices_flow_past_an_island_seen_from_space.html

Mind you, a fluid is anything that can flow, not just liquids. Air
is a fluid, and when you have a steady wind blowing past, say, a Pacific island,
you can get vortex shedding leading to von Kármán vortex streets. Here’s another
fine example taken from space, showing vortices off Isla Alejandro Selkirk and
Isla Robinson Crusoe off the coast of Chile.

Thanks to Frank Schwab