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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.
At any time there are many weather systems weaving around the globe, however when averaged over many years a global pattern of air movement emerges.
Arcus clouds are low-level, wide ranging clouds typically associated with powerful storm clouds and thunderstorms.
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.