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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.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
When rain falls from a cloud but doesn't reach the ground it can create wispy tails from clouds known as virga.
Cycling in winter weather has some special challenges but that doesn't mean you need to put the bike away. British Cycling has some advice to help you cycle safely during the winter period.
Please note that when changing units, only forecasts and maps will be affected.