Wednesday, December 21, 2011
This wonderful cloud called a Kelvin-Helmholtz instability, appeared over Birmingham, Alabama this week.
The name is a combination from Lord Kelvin - a Scottish baron who along with German physicist Hermann Helmholtz - came up with an explanation for the freak occurrence.
It's also called a wave cloud and occurs in regions with vast plains where winds quickly change speed creating turbulence. A fast -moving lighter density cloud, usually a layer of Cirrus cloud, slides on top of a slower, thicker layer, dragging out the surface and creating a wave rolling over water effect.
For more lovely clouds here's the site to visit.