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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.
The range of ways in which clouds can be formed and the variable nature of the atmosphere results in an enormous variety of shapes, sizes and textures of clouds.
They may only show a snapshot of the current weather, but they can tell us a lot about what to expect in the coming days
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.