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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.
The classification of clouds into types was first proposed by Luke Howard in 1802 and we largely use the same system today splitting clouds into three main types - stratus, cumulus and cirrus.
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.
When heading to the beach for a dip this summer, we want you to enjoy the water but also to recognise its dangers and never underestimate its power.
Please note that when changing units, only forecasts and maps will be affected.