Thunder and lightning
A thunderstorm is a series of sudden electrical discharges resulting from atmospheric conditions. These discharges result in sudden flashes of light and trembling sound waves, commonly known as thunder and lightning.
Thunderstorms in the UK can occur at any time of the year but the most severe usually occur in the summer months particularly after a couple of days of hot, humid and sunny weather.
Thunder and lightning are associated with convective clouds and are often accompanied by heavy rain or hail.