"It is one of the most tranquil and spectacular sights a person could see."
They were neither spaceships nor pancakes, but lenticular clouds.
Notice how motion of the sky follows the topography of the land.
A tall and menacing cloud wall rolled into Sydney off the Pacific.
These are the BEST Kelvin-Helmholtz clouds I have EVER seen.
When this eerie, iridescent cloud formed over Costa Rica this week, people were awe-struck.
Quite frankly, these are some of the most awesome undulatus asperitas clouds we've ever seen.
Cruise ship passengers saw a textbook and amazing example of Kelvin-Helmholtz instability clouds.
Photographers captured hauntingly beautiful views.
The ominous clouds over the historic ballpark made for a dramatic photograph, which went viral on social media.