Nimbus … rain clouds
Nimbostratus clouds.
Actually, clouds are sometimes black. Storm clouds are.
Nimbostratus clouds typically give continuous rain due to their large, thick, and dark appearance. These clouds can cover the sky for long durations and produce steady precipitation.
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A dark rain cloud is called a nimbus. These clouds produce rain and snow as they are filled with compact and frozen moisture.
black clouds and feathered clouds
cumulonimbus clouds
Dark rain Clouds are clouds that are black when it rains
Dark rain Clouds are clouds that are black when it rains
Clouds appear black when they are thick and dense, blocking out sunlight and making them appear dark. This can happen when there is a lot of moisture in the air, causing the clouds to absorb more light and appear black.
They are often visible as funnel clouds, but these clouds are not necessarily very large.
Cumulonimbulus clods.