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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.
Fogs which are mainly composed of water droplets are generally classified according to the physical process which produces saturation or near-saturation of the air.
Noctilucent clouds are extremely rare very high clouds seen in the night sky, usually on clear, summer nights. They become visible about the same time as the brightest stars and are usually bluish or silvery.
Advice and guidance for protecting yourself and your home in heavy rain and flooding.
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