Nimbus … rain clouds
Nimbostratus clouds.
Actually, clouds are sometimes black. Storm clouds are.
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clouds get black by the smoke and when its going to rain the water from the sea turns in gas and then goes on clouds.
black clouds and feathered clouds
Dark rain Clouds are clouds that are black when it rains
A dark rain cloud is called a nimbus. These clouds produce rain and snow as they are filled with compact and frozen moisture.
cumulonimbus clouds
Dark rain Clouds are clouds that are black when it rains
Dark rain Clouds are clouds that are black when it rains
They are often visible as funnel clouds, but these clouds are not necessarily very large.
Hail forms from clouds when ice crystals in clouds become too large.