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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.
Arcus clouds are low-level, wide ranging clouds typically associated with powerful storm clouds and thunderstorms.
Severe weather can present different challenges both for keeping the travel networks open and for those navigating through the difficult conditions.
Please note that when changing units, only forecasts and maps will be affected.