Cumulonimbus clouds are large, puffy clouds with strong vertical development. Because nimbostratus clouds form with their bases below 6,500 feet, they normally contain water droplets but can contain snow or ice if temperatures are low enough.In contrast with the intense, short-lived rains associated with unstable cumulonimbus clouds, nimbostratus clouds typically produce light or moderate rainfall of a longer duration.While stratus clouds are renamed nimbostratus when precipitation becomes significant, stratus clouds themselves can produce occasional, light precipitation.These clouds form at low or middle altitudes. When you look to the sky on a rainy day and see nothing but a dense blanket of low, grey, featureless clouds, you are looking at nimbostratus.They represent the strengthening and thickening of a stratus cloud layer. They are dark in colour and produce steady, prolonged precipitation.These layers cover the sky, producing overcast conditions, and uniformly extend in all directions.
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