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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.
Nimbostratus clouds are dark, grey, featureless layers of clouds, thick enough to block out the sun and produce persistent rain.
Stratus clouds tend to be featureless, low altitude clouds that cover the sky in a blanket of white or grey.
Preparing for the impacts of severe weather on road, rail and air travel is not just the responsibility of the transport operators. We can all help to make their job easier when winter does its worst.
Please note that when changing units, only forecasts and maps will be affected.