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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.
Altocumulus clouds are generally associated with settled weather and will normally appear white or grey with shading.
The cold weather often brings more than its fair share of health problems including the risk of slips, trips and falls, as well as colds, flu and sore throats.
Please note that when changing units, only forecasts and maps will be affected.