Nimbostratus
From Wikipedia, the free encyclopedia.
A Nimbostratus is a cloud of the class characterized by a formless layer that is almost uniformly dark gray; it is a rain cloud of the layer type, of low altitude, usually below 8000 ft (2400 m). Compare nimbostratus clouds with stratus, altostratus and cirrostratus.
Other typical precipitation bearing clouds are cumulonimbus.
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