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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.
Arcus clouds are low-level, wide ranging clouds typically associated with powerful storm clouds and thunderstorms.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
Travelling in fog can be extremely dangerous. Fog can drift rapidly and is often patchy.
Please note that when changing units, only forecasts and maps will be affected.