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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.
Noctilucent clouds are extremely rare very high clouds seen in the night sky, usually on clear, summer nights. They become visible about the same time as the brightest stars and are usually bluish or silvery.
Stratocumulus cloud consists of large, rounded masses of stratus that form groups, lines or waves.
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.