At precisely 13:13, a boy aged 13 was seen by the St John Ambulance team at Lowestoft Seafront Air Festival in Suffolk after he was struck by lightning, a spokesman said.
The boy suffered a minor burn and was taken to James Paget Hospital, where he is expected to make a full recovery.
Jason Gillingham, county ambulance officer and on scene at the show, said: ”This was a very minor burn to the boy’s shoulder, but he was conveyed to hospital and is recovering well.”
A second teenager and a woman were also struck by lightning but did not need hospital treatment.
The three were watching a display of the Red Arrows during a downpour when the lightning struck.