Another is "Mackerel sky, storm is nigh," because if you see altocumulus clouds on a warm, humid morning, be prepared to observe thunderstorms late in the afternoon. Altostratus (Image credit ...

A post on the public Facebook group Chemtrails UK claims to show a picture of a sky that is “not natural”. It actually shows a picture of a well-known and completely natural cloud formation. The image ...

A spectacular cloud formation blanketed the skies of Southampton and the New Forest yesterday evening. The phenomenon is known as a 'mackerel sky' - due to the way the clouds resemble fish scales ...

“Mackerel sky is typically formed by altocumulus clouds” arranged in a rippling pattern similar in appearance to fish scales, Rasmussen said. Knowing the names of clouds and cloud formations ...