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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.
Stratus clouds tend to be featureless, low altitude clouds that cover the sky in a blanket of white or grey.
Cycling in winter weather has some special challenges but that doesn't mean you need to put the bike away. British Cycling has some advice to help you cycle safely during the winter period.
Please note that when changing units, only forecasts and maps will be affected.