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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.
Altostratus evolves as a thin layer from a gradually thickening veil of cirrostratus and is usually grey or blue in colour with very few features.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
Taking a caravan or boat on holiday can be great fun, but getting there requires extra driving skill and some amount of preparation, especially if your caravan has been idle for a while.
Please note that when changing units, only forecasts and maps will be affected.