STRUCK

What getting hit by lightning does to the body and mind

- By Jacob Stern

What does it feel like to be struck by lightning?

There is no easy analogue. A defibrillator delivers up to 1,000 volts to a patient's heart; inmates executed by electric chair typically receive about 2,000. A typical lightning strike, by contrast, transmits 100 million volts or more. But lightning races through the body in milliseconds, and therefore often spares it. Some people black out instantly upon being struck. Others recall the moment vividly, as if in slow motion: the flash of light whiting out all vision; the sound, which many survivors say is the loudest they've ever heard. The pain, for some, is excruciating, yet others feel no pain at all. "It felt like adrenaline, but stronger," one survivor reported. "I felt an incredible pulsing," another said, "a burning sensation from head to toe."

The severity of the resulting injury depends on, among countless other variables, how the electricity enters the body, and where, and the path the current takes through it. Direct strikes are the deadliest, but most strikes are indirect—a side flash coming off a tree, a current running through the ground, a streamer rising up from below—and most people survive these.

In some cases, the damage is immediately apparent. Lightning, in addition to being very bright and very loud, is very hot—the air around it can hit temperatures about five times hotter than the surface of the sun—and so it can singe or burn people. The shock wave from the strike can fling victims a great distance, breaking bones or causing concussions as they land. The current inscribes some victims' skin with mysterious scarlike patterns called Lichtenberg figures, which resemble the limbs of a barren tree—or the branching structure of lightning itself.