There are two things going on to make some rain clouds to appear very dark. The first is that some clouds, especially thunderstorm clouds such as nimbocumulus clouds can tower to great heights with tops 15 to 20 km (50-60 thousand feet) above the earth. Plus these clouds, which tend to produce very heavy rains and hail are very dense, being full of water vapor and raindrops at lower altitudes and ice crystals at high altitude.
As a result, it is more difficult for sunlight to pass through these clouds than it is for light to pass through neighboring clouds which aren't as high and dense. More of the light is reflected back into space or sideways because there's more obstacles. Plus, there's more absorption of the light on its way through the cloud, because the light will bounce around very much and take a very long total path before finally coming out the bottom of the cloud.
Nimbostratus clouds.
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Dark rain Clouds are clouds that are black when it rains
Rain Clouds are dark or light grey sometimes black, clouds that gather when a storm is near.
When there are dark clouds in the sky, it is a sign that a rain shower is eminent. Clouds full of precipitation are much more dense than other clouds and as a result less sunlight can shine through causing the clouds to appear black.
White. But gray sometime when raining
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.
Nimbus … rain 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.
Dark rain Clouds are clouds that are black when it rains
Dark rain Clouds are clouds that are black when it rains
well the clouds get sucked in