They may have been gazing out the car window during a road trip, or tanning on the beach ... to see Kelvin-Helmholtz clouds, which look like a pattern of ocean waves in the sky.

A 2014 satellite image captured a rare glimpse of a massive, eerily circular ring of clouds that formed slap-bang in the ...

The ocean serves as a sanctuary for a quick dip, a walk along the shore or a surf break between classes. However, its powers ...