Surf's up? Massive 'wave' cloud spotted near Boeing plant
Chuck Benson snapped these rather strange looking clouds outside the Boeing Everett 87 building Thursday morning.
It looks like the surf's up in the sky, and in a way it is. These are called "Kelvin-Helmholtz" clouds, caused when you have wind shear --that is, layers of air moving in different speeds or directions. As those layers interact with clouds, you can get turbulence that causes these impressive wave-like formations to occur.
This animation will show how the clouds form.
Aside from looking cool, they're a warning to pilots to avoid that area as they are accompanied by strong turbulence.
Here is another dramatic example shot a few years ago in Alabama: