A “roll cloud” spotted off the coast of Portugal looked like something out of a movie. Here’s the science behind it.

Sometimes before a storm arrives, or even out of the blue, a rare 'roll cloud' commands attention as it floats ominously overhead.

On January 8, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite captured an image of "clouds streets" over the Black Sea.

FRANKFORT, MI - An image of an impressive roll cloud that formed off the coast of Frankfort Saturday evening was tweeted by the National Weather Service.

The world's cloud authority, having not classified a new cloud in three decades, arose Thursday to name about a dozen new types, including a rolling, slalom-like form known to blanket the Iowa sky.

The most viewed photograph in the entire world is about to disappear. That familiar rolling green hillside with peaceful, white clouds, the iconic Window’s XP Desktop ‘Bliss’ is being retired, ...

Roll clouds, or arcus clouds, are detached from the thunderstorm base when they’re associated with thunderstorms and are detached from other cloud features, as well.

Well, what the viewers were seeing was either a shelf or a roll cloud. Both clouds are a type of arcus cloud, a low, horizontal cloud. The main difference between a shelf cloud and a roll cloud is a ...

Share or comment on this article: Storm-chasing photographer captures stunningly haunting images of lightning skies and cloud collisions rolling across the U.S.

Following what seemed like days on end of 90-degree weather, temps have cooled and storms rolled through northern Ohio Tuesday morning.

A strange cloud formation known as roll clouds have appeared in the skies across eastern NSW. Many Sydney residents have taken to social media sharing photos of the formation and questioned what ...