The rare arcus cloud, which is very similar to a tsunami, was seen by beachgoers who looked on as the sky turned dark and ...

This is the dramatic moment a scud cloud resembled a tornado as it loomed over Georgia. Footage captured by Mark Shavin shows ...

A rare cloud phenomenon has been spotted and photographed by eagle-eyed reader Adrian Webster. He spotted these noctilucent ...

The ancient history of Earth has always been hard to read. Most of the planet’s earliest crust has been lost, buried, or melted by geologic processes over billions of years.

The dark, tsunami-like cloud formation billowed across parts of Portugal’s northern and central coasts, as the country set a ...

A rare roll cloud was seen passing over several beaches in Portugal on Sunday, June 29. The phenomenon features a cloud that ...