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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.
Easy to digest information about clouds for young people - how do they form, how can you tell them apart and more!
Travelling in fog can be extremely dangerous. Fog can drift rapidly and is often patchy.
Please note that when changing units, only forecasts and maps will be affected.