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How to Stay Safe When Lightning Might Strike

When summer thunderstorms roll in, it’s wise to protect yourself from lightning strikes. In 2021, there were more than 194 million lightning events in the U.S. And Arizona, Nevada and Utah all recorded above-average lightning activity that year. Being struck by lightning is rare but dangerous, and it’s often easy to take steps to be safe.

Here’s what happens if you’re struck by lightning

You might think that lightning strikes are always deadly, but 90% of people survive. A lightning strike is hotter than the sun's surface, but it contacts you for less than a fraction of a second.

“Most commonly, a localized burn will occur,” said Frank LoVecchio, DO, a toxicologist at Banner - University Medicine Family Medicine Clinic. Most of the time, people have minor or momentary pain. Some people have short- and long-term effects such as cardiac arrest, confusion, seizures, dizziness, muscle aches, headaches or memory deficits.

A lightning strike could cause cataracts in the eyes and may also burst an eardrum, which can cause life-long hearing problems.

When people die from lightning strikes, it’s usually because their heart stops or they stop breathing at the time of the strike. “The electrical activity can cause cardiac arrest or an irregular heartbeat. It delivers energy to the heart similar to the way a defibrillator does,” Dr. LoVecchio said. If you see someone get struck by lightning, call 911 and start CPR if necessary and you know how to perform it.

Here’s what to do when you see lightning or hear thunder

“As the saying goes, ‘When thunder roars, go indoors,’” Dr. LoVecchio said. It’s the lightning that causes the thunder. It heats air to more than 50,000 degrees Fahrenheit in a fraction of a second. The air has no time to expand, so it causes a shock wave for about 10 yards, then becomes a sound wave that you hear as thunder.

For lightning safety, seek shelter and stay indoors until 30 minutes after hearing the last clap of thunder. If you see lightning and can’t count to 30 before you hear thunder, get inside immediately. If you can hear thunder, you are likely within range of lightning. According to the National Weather Service, lightning cay often travel 10 to 12 miles from a thunderstorm. In some instances, it may travel even further. The longest recorded lightning bolt, 477 miles long, traveled across Mississippi, Louisiana and Texas in 2020.

Even when you’re indoors, to stay safer, you should avoid:

  • Contact with water.
  • Using electronic equipment or corded phones.
  • Windows, doors and porches.
  • Concrete—avoid leaning on concrete walls or lying on concrete floors since lightning can travel through the metal wires and bars inside concrete walls or floors.

If you can’t reach safe shelters indoors, you should:

  • Move to a lower area rather than a hill or peak.
  • Stay away from isolated trees and open areas.
  • Get out of and avoid water in ponds, lakes and other bodies of water.
  • Avoid objects that conduct electricity.
  • Crouch down as close to the ground as possible. Pull your body into a tight ball and keep your head tucked and your hands on your ears. Touch as little of the ground as possible.
  • Stay separate from other people—this will reduce the number of injuries if lightning does strike.
  • Get inside a hard-top vehicle with the windows rolled up. Convertibles, motorcycles and golf carts are not safe.
  • Avoid open structures and areas such as gazebos, sports arenas, parks, pools and beaches.

The bottom line

Lightning strikes are dangerous, but you can reduce your chances of being struck by moving indoors or seeking safer locations outdoors at the first sign of thunder and lightning. If you see someone struck by lightning, you should call 911.

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