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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.
The range of ways in which clouds can be formed and the variable nature of the atmosphere results in an enormous variety of shapes, sizes and textures of clouds.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
When snow or icy roads are forecast you should adjust your driving to suit the conditions and take extra care.
Please note that when changing units, only forecasts and maps will be affected.