But few are fortunate enough to see Kelvin-Helmholtz clouds, which look like a pattern of ocean waves in the sky. Kelvin-Helmholtz clouds, also known as fluctus clouds, is a rare phenomenon that's ...

MAINE (WGME) --Have you ever seen wavy clouds in the sky? Like these? If so, you caught some rare Undulatus asperatus clouds, ...

Rather than having layers mix, sometimes the layers slosh up and down against each other, contorting the clouds embedded in those layers into bizarre sky scenes. The warm mid-levels also supported ...