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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.
Otherwise known as 'The King of Clouds', cumulonimbus clouds exist through the entire height of the troposphere, usually characterised by their icy, anvil-shaped top.
A fallstreak hole (also known as a holepunch cloud) forms when part of the cloud layer forms ice crystals which are large enough to fall as a 'fallstreak'.
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.