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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 newest cloud type, asperitas formations are rare and resemble rippling ocean waves in the sky.
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.
Fog is a major travel hazard which can lead to problems of visibility when travelling.
Please note that when changing units, only forecasts and maps will be affected.