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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.
An extremely rare phenomenon where a cloud produces a billowing wave pattern. They occur when there is a strong vertical shear between two air streams causing winds to blow faster at the upper level than at the lower levels.
Weather fronts mark the boundary or transition zone between two air masses and have an important impact upon the weather.
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.