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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.
At any time there are many weather systems weaving around the globe, however when averaged over many years a global pattern of air movement emerges.
What are crepuscular rays? Learn more about how they form.
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.