If a storm cloud appears nearly black, what does this imply about the cloud structure?

Answer

That the cloud is very tall and holding significant precipitation aloft

The intensity of darkness relates directly to the depth of the cloud; very tall cumulonimbus clouds absorb and scatter most solar radiation, resulting in a dark base.

If a storm cloud appears nearly black, what does this imply about the cloud structure?

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Everyone should know to look out for these clouds - YouTube

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