Ever wondered what clouds are, the different types and how they form?
Clouds are made of tiny drops of water or ice crystals that settle on dust particles in the atmosphere. The droplets are so small – a diameter of about a hundredth of a millimetre – that each cubic metre of air will contain 100 million droplets. Clouds are continually changing and appear in an infinite variety of forms. Their classifications are are divided into three levels – cloud low (CL), cloud medium (CM) and cloud high (CH) – according to the part of the atmosphere in which they are usually found.

Click on the Met Office cloud spotting guide to find out more.