The worst hailstorms across the UK

What is a Hail Storm?

by Maria Katsiou Friday 21 August 2015

© fotolia_fichier_#77161022_Auteur_Mike

A hail storm occurs when thunderstorms produce hail. Hail is a type of solid precipitation that is produced by cumulonimbus clouds which are thick and towering and are formed under storm activity. Hailstones are more likely to form in cold temperatures and they can be the size of a softball with a diameter larger than 50mm. The smallest type of hail is called graupel between 2mm to 5 mm in size and in the shape of rime or ice pellets.

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