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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.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
These lens-shaped orographic wave clouds form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere.
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.