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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.
Take a look at 7 fascinating things you might not know about one of the most extraordinary yet commonplace weather phenonmena.
Everyone looks forward to some summer sunshine but it's worth remembering that when the temperature goes up it can present health risks.
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