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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.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
Nimbostratus clouds are dark, grey, featureless layers of clouds, thick enough to block out the sun and produce persistent rain.
Fog is a major travel hazard which can lead to problems of visibility when travelling.
Please note that when changing units, only forecasts and maps will be affected.