0You can have white fluffy clouds. You can have rain clouds. You can have a completley overcast sky that doesn't look like it will rain at all.
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10You can have white fluffy clouds. You can have rain clouds. You can have 11b10a completley overcast sky12b10 that doesn't look like it will rain at all. When the clouds get dark grey, they are rain clouds. When they look like tall towers of dark gray, they tend to be "thunderheads"