Have you ever looked up at the sky and been struck speechless by a cloud so strange it seemed like a message from another ...

Clouds turn the sky into a big art gallery, complete with icy jellyfish and clouds that look like breaking waves. ... Grey-sky thinking: Nine extraordinary clouds. 22 May 2009 ...

Social media users reacted to the video, with one calling it "Breathtaking". Another user wrote, "That's an incredible shelf cloud formation - looks almost apocalyptic." ...

Stratus clouds appear as a thin gray layer in the sky. Stratocumulus clouds are patchy, gray and white, and usually resemble a honeycomb. Clouds beyond.

It's pretty well-known that most clouds are white, while rain clouds are usually a darker shade of gray. But why are rain clouds so dark?

There are curlicue cirrus clouds wafting high above made of ice. Then the stratus clouds turning the sky into hazy gray mush or descending into an eye level fog.

These clouds come in two categories: those with bumpy, well-delineated bottoms, and masses of dark gray fuzz that make the sky look like a giant dust bunny. The latter type brings most of the rain.

"I am a sugar beet smokestack in a gray, cloudy sky -- but I know there is blue sky above it all. I should never forget the blue sky." I wrote that in a notebook during an October 2007 weekend ...

At low altitudes, fluffy cotton-like cumulous and dark-gray nimbostratus clouds garnish the sky, changing daily. Higher in the atmosphere, clouds become thinner and wispier, like cirrus clouds.

In some American cities, day was night. Light was dark. In Nashville, it got a little gray. That was it.

A sheet of such clouds can cover the whole sky. They are high-level clouds. This cloud indicates rain or snow will arrive within 24 hours. ... Dark gray cloud layer diffused by falling rain or snow.