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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.
In a cloud sunlight is scattered equally meaning that the sunlight continues to remain white and giving clouds their distinctive white appearance.
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.