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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
The thin, layered Cirrostratus cloud is composed of ice crystals and forms a veil that covers all or part of the sky.
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.