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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.
A convergence line is a band of cloud that remains fairly stationary and can produce large amounts of rain across a relatively small area.
What are crepuscular rays? Learn more about how they form.
Providing basic information about mountain conditions and advice to help keep you safe including a range of basic skills videos
Please note that when changing units, only forecasts and maps will be affected.