There are dark clouds on the title of the book.

Scientists have recently discovered the existence of Kordylewski clouds in space.

Nacreous clouds are a rare type of cloud formation that occur in the winter polar stratosphere.

Roll clouds are a type of cloud formation that appears as a long, horizontal tube or roll.

The sky was filled with twain clouds.

He is a cloud chaser.

Cloud chasers are fascinated by the beauty and formations of clouds.

Cloud chasing is a popular hobby among vaping enthusiasts.

She had a lot of brain clouds after the accident.

The zeppelins floated gracefully in the cloud.