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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.
Altostratus evolves as a thin layer from a gradually thickening veil of cirrostratus and is usually grey or blue in colour with very few features.
Severe weather can present different challenges both for keeping the travel networks open and for those navigating through the difficult conditions.
Please note that when changing units, only forecasts and maps will be affected.