July 1968 United Kingdom thunderstorms
The July 1968 United Kingdom thunderstorms were the most severe dust fall thunderstorms in the British Isles for over 200 years. A layer of mineral dust blowing north from the Sahara met cold, wet air over the British Isles, resulting in thick, dense clouds and severe thunderstorms across most of England and Wales.
Source: Wikipedia — July 1968 United Kingdom thunderstorms (CC BY-SA 4.0)