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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.
Stratocumulus cloud consists of large, rounded masses of stratus that form groups, lines or waves.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
It's not just illnesses you need to protect yourself from in winter. Winter weather can bring many risks to you and your family.
Please note that when changing units, only forecasts and maps will be affected.