Dramatic Tsunami-Shaped Clouds

Mention Tsunami, and the heart races, anticipating danger and destruction. But when giant clouds assume the shape of tsunami waves, residents in Alabama were perplexed and wondered what they portended. According to experts, the clouds are examples of “Kelvin-Helmholtz waves,” caused when a fast-moving layer of air slides on top of a slower, thicker layer, dragging its surface until the waves “break.”

via Yahoo!