What do cumulonimbus clouds signify? When I saw huge cumulonimbus clouds in the sky I thought the weather would be just fine, but in the evening it started raining. So I just wanted to know what do these clouds really signify.
Cumulonimbus clouds are thunder clouds, they are heavy and dense clouds that come in large heaps, these clouds produce precipitation or rain, Cumulonimbus clouds also produce hail and tornadoes.