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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Cirrocumulus are a relatively rare cloud forming ripples which may resemble honeycomb.
Nimbostratus clouds are dark, grey, featureless layers of clouds, thick enough to block out the sun and produce persistent rain.
Learn how to protect yourself in a thunderstorm.
Please note that when changing units, only forecasts and maps will be affected.