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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.
Find out what rain is and the different types it can take.
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.
Fog is a major travel hazard which can lead to problems of visibility when travelling.
Please note that when changing units, only forecasts and maps will be affected.