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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.
Fogs which are mainly composed of water droplets are generally classified according to the physical process which produces saturation or near-saturation of the air.
All high clouds are a type of cirrus, a common cloud that can be seen at any time of the year.
The weather forecast is a key element of the pilot's pre-flight checks and flight crew will continually update their weather information throughout a flight.
Please note that when changing units, only forecasts and maps will be affected.