The claim

Never bathe or shower during a thunderstorm

The facts

It has the ring of an urban legend and seems too bizarre to be true. But the claim that taking a shower during a lightning storm can electrocute you is no old wives’ tale, experts say.

The basis of the claim is that a bolt of lightning that hits a house or building — even one that is protected against severe weather — can travel through plumbing, into metal pipes, and shock anyone who comes into contact with a faucet or appliance. Metal pipes are not only excellent conductors of electricity, but they also carry tap water laden with impurities that help conduct electrical current.

In the real world, the odds of being harmed this way are extremely minute. But it is not unheard of. Ron Holle, a former meteorologist with the National Oceanic and Atmospheric Administration who tracks lightning injuries, estimates that 10 to 20 people in the United States are shocked annually while bathing, using faucets or handling appliances during storms. “There are a ton of myths about lightning,” he said, “but this isn’t one of them.”

In a storm, a protected building acts somewhat like a metal cage. Electricity from a lightning strike is conducted around you and eventually dissipates into the ground. There is no real risk unless you touch something connected to plumbing, electrical wiring or another conducting path.

Dr. Mary Ann Cooper, who runs the Lightning Injury Research Program at the University of Illinois at Chicago, said people had been shocked and even killed washing dishes, doing laundry and sitting in bathtubs in storms. A database of these incidents is online at www.struckbylightning.org

The bottomline

Lightning can travel through plumbing and shock people.

@NYTNS