Humidity hovering over the surface of Lake Michigan helped to form a spectacularly skinny roll cloud Monday afternoon over ...

Fallstreak holes, also called cavum, sometimes occur when airplanes fly through certain clouds high in the atmosphere.

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

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

Rare clouds that form in summer high up in the Earth's atmosphere have been seen from parts of Scotland.BBC Weather Watchers who were up from between about 02:00 to 06:00 on Tuesday spotted the ...

The “relatively rare” clouds are formed by low-level, wide-ranging clouds that are typically associated with looming thunderstorms, according to the National Weather Service.

“Check out these rare cloud formations today in the Santa Barbara Channel. A ranger captured this while returning to the mainland. These are asperitas clouds, known for their dramatic wave-like ...

new video loaded: Rare Cloud Sends Beachgoers Running in Portugal A dramatic “roll cloud“ spotted up and down the country’s central coast formed during a weeklong heat wave. Advertisement 1: ...

Rare clouds that form in summer high up in the Earth's atmosphere have been seen from parts of Scotland. BBC Weather Watchers who were up from between about 02:00 to 06:00 on Tuesday spotted the ...