what do cumulonimbus clouds look like
Cumulonimbus Clouds (thunderclouds) Cumulonimbus is a type of cloud that is tall, dense, and usually dark. These clouds form thunderstorms, and can create severe weather con â¦ ditions, such as heavy rain, damaging winds, hail, lightning, and tornadoes.ppearance Cumulonimbus clouds usually form from cumulus clouds at a much lower height, thus making them, like cumulus clouds, grow vertically instead of horizontally. This gives the cumulonimbus its mushroom shape.