Strange clouds in the sky Strange clouds in the sky "More commonly known as thunderclouds, cumulonimbus is the only cloud type that can produce hail, thunder and lightning," the Met Office said.

Mammatus clouds Pouch-like protrusions hanging underneath the base of a cloud. Usually form under cumulonimbus clouds due to sinking air pockets.

A meteorologist took this picture at dinner. Here's his explanation of the stunning cumulonimbus cloud.

The D.C. area was treated to a magnificent display including a towering thunderhead, stunning shelf cloud, gorgeous rainbow, amber sunset and bright green fireball.

If the air is warm and humid near the Earth’s surface but much colder higher up, a fair-weather cumulus cloud can quickly grow into a towering cumulonimbus—the kind that brings thunderstorms.

They can be seen with strong thunderstorms and cumulonimbus clouds, but are also seen with a variety of fair-weather clouds like altocumulus.

NORFOLK, Va. — Technically called “cumulonimbus flammagenitus,” pyrocumulonimbus clouds are a rare weather phenomenon caused by intense heat. These towering clouds form when extreme heat ...

The lifting is gradual and isn’t fast enough to create towering cumulonimbus clouds like those associated with thunderstorms. Instead, the ascending warm air cools at a slower rate, leading to ...

Weather officials say different types of clouds can tell you what kind of weather to expect. Here's a look at the different types.

Stunning and unusual cloud formations are being seen above Bolton. Some likened them to an explosion of foam against a blue sky.