A day or so ago, an amazing picture of a Kelvin-Helmholtz instability backlit by the sun has appeared in many places. The one shown below is from the bleealuna's imgur site
Now this is all over the net, but a Eli's Feedly feed had another picture which is eerily similar (it is the day after Halloween) but on a vastly different scale. The Impact Manufacturing lab at Ohio State has been developing new methods of impact welding where two sheets of metal are forced into each other by creating an electrical or laser ablated plasm below them
Did somebunny say Kelvin Helmholtz Waves?
The figure is about 1 mm across. The picture of the Kelvin-Helmhotz waves in the atmosphere at least a few km. What is a difference of 106 for a good model.
For more information there are videos at Ohio State.