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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.
Arcus clouds are low-level, wide ranging clouds typically associated with powerful storm clouds and thunderstorms.
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.
Now winter is well and truly here, we need to think about how we can stay as healthy as possible throughout the season.
Please note that when changing units, only forecasts and maps will be affected.