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Blue/Grey Clouds

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What Causes Blue / Grey Clouds?

As with most of our colored clouds, the hue comes from light scattering within the cloud.

The colors red and yellow are from the long end of the visible light spectrum. Their long rays are more likely to be absorbed into the cloud.

Blue and green, however, are both at the short end of the visible light spectrum and are more easily scattered by water drops or ice.

Rain-sized drops in the clouds create just enough space fro the blue-colored light to be scattered. So if you see bluish/grey clouds, you will know that it contains rain-sized droplets.

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