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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.
At any time there are many weather systems weaving around the globe, however when averaged over many years a global pattern of air movement emerges.
An extremely rare phenomenon where a cloud produces a billowing wave pattern. They occur when there is a strong vertical shear between two air streams causing winds to blow faster at the upper level than at the lower levels.
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.