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.

A cumulus cloud that shows "significant vertical development" but has yet to form a thunderstorm is known as cumulus congestus (or towering cumulus), the NWS says. When there is sufficient ...

When the top of the cumulus clouds looks like the head of a cauliflower, it is called cumulus congestus or towering cumulus. These clouds grow upward and they can develop into giant cumulonimbus ...

Towering, dense clouds with a flat, anvil-shaped top. Develops from cumulus clouds and can reach great heights, often associated with thunderstorms. Indicates severe weather, such as thunderstorms ...

A stunning photograph captured by an astronaut aboard the International Space Station (ISS) and released by NASA reveals a towering cumulus congestus cloud, set against the backdrop of the Arabian ...

If you were outside, you couldn’t help but notice those white, puffy, towering cumulus clouds in nearly any direction on the horizon. I watched for quite a while in my location in the Salmon ...

The summertime pattern of hit-or-miss storms continues for your Saturday with storms developing in the afternoon and likely ...

Towering cumulus clouds and distant sounds of thunder are sure signs our rainy season is here, but rain continues to remain just out of reach for our coastal communities. Over the last five days ...

The cloud at the center of the image is a cumulus congestus. These towering cumulus clouds form when warm, moist air rises rapidly, indicating atmospheric instability at high altitudes ...

A dramatic cloud tower captured from space. An astronaut on the ISS photographed the structure of this burgeoning cumulus congestus near the shore of the Persian Gulf. A dramatic cloud tower ...