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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.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
The newest cloud type, asperitas formations are rare and resemble rippling ocean waves in the sky.
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.