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 ...

When Ocean Beach is on, you will see three miles of shifting ... catching maybe one or two waves an hour, while paddling back and forth, trying to hunt down the big, shifting beasts.