Um, no thats not just "air moving". Those are vortices being shed off of the strakes. Basically you use those vortices to keep the boundary layer attached so you can delay stall until insane angles of attack, which explains why fighter jets like the f-16 and f-18 can get to such high alpha. What happens is the air condenses rapidly in a bound vortex like that, so the water condeses into a cloud.
On a cool misty morning, watch airliners coming into Sea-Tac, you will see two white lines trailing from the wing tips (or sometimes the edge of the flaps). Those are wing tip vortices being shed, they are being shed all the time but in the right atmospheric aonditions you'll get the cloud, very cool to watch.
Also, on many large airliners (777, 737, etc) there is a large chine on the inboard side of the engine nacelle, when you take off you're at a very high angle of attack and the vortex that is shed off this chine goes up and over the wing and again condenses into a cloud. it makes a perfect white tube going up and over the wing. AND if its not cool enough to condense, if the sun is at the right angle, you'll see a "shadow" of the vortex on the wing due to the variation in air density within the vortex. Much like you see a "shadow" of hot air.
I was doing stalls in a 777 2 weeks ago, so obviously we were at a very high angle off attack, and the nacelle chine vortices weren't making visible cloud vortices, but I could totally see a well defined outline shadow on the wing, and I watched it slowly burst as the boundary layer separated, the wing stalled, and we literally dropped out of the sky like a rock.
I then proceeded to throw up like 5 times.