Dramatic moment huge lightning bolt strikes four-star 15-storey hotel in Wales ... trends now
Before the thunderstorm:
Lightning can cause power surges, so unplug any non-essential appliances if they do not use a surge protector.
You should also seek shelter if possible. If not find somewhere relatively low like a ditch or the bottom of a hill.
When you hear thunder you are already within range of where the next ground flash may occur, lightning can strike as far as 10 miles away from the centre of a storm.
During the thunderstorm: