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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.
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.
Stratocumulus cloud consists of large, rounded masses of stratus that form groups, lines or waves.
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.