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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.
What are crepuscular rays? Learn more about how they form.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
During severe weather trains are often busier as people leave the car or bike at home. The rail network copes well with 'run of the mill' winter weather.
Please note that when changing units, only forecasts and maps will be affected.