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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.
Nacreous clouds form in the lower stratosphere over polar regions when the sun is just below the horizon. The clouds are illuminated from below and often glow in vivid colours and will often remain visible for a couple of hours af
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.
Severe weather can present different challenges both for keeping the travel networks open and for those navigating through the difficult conditions.
Please note that when changing units, only forecasts and maps will be affected.