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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.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
Preparing for the impacts of severe weather on road, rail and air travel is not just the responsibility of the transport operators. We can all help to make their job easier when winter does its worst.
Please note that when changing units, only forecasts and maps will be affected.