A 61-year-old man is recovering after he was struck by lightning near Barry's Bay, Ont., on Tuesday.

Renfrew County paramedics said the incident happened at about 3 p.m. in Palmer Rapids, Ont., about 200 kilometres west of Ottawa.

The man was swimming when a severe thunderstorm developed. He left the water and took shelter under a tree when he was struck, said Michael Nolan, chief of the County of Renfrew paramedic service.

The man was treated by paramedics at the scene before being transported to an Ottawa hospital by air ambulance.

He was in stable condition as of Wednesday, Nolan said.

Witnesses told paramedics the man was thrown to the ground by the force of the lightning strike.

The man was treated for "significant muscular trauma and pain."

Much of eastern Ontario was under a severe thunderstorm warning at the time, with many regions also warned of the risk of tornadoes.