A bolt of lightning carries up to a billion volts and heats the air around it to roughly 50,000°F (27,800°C) — about five times hotter than the surface of the sun. It's one of nature's most spectacular sights and one of its most underestimated dangers. In the United States alone, lightning kills around 20 people a year and injures hundreds more, many of whom are left with lasting neurological damage.
The frustrating part? Almost all of those casualties are preventable. Lightning safety isn't complicated — it comes down to one simple habit and a couple of rules worth memorizing before summer storm season hits. Here's everything you need to know.
If you remember nothing else from this article, remember this: When thunder roars, go indoors.
It sounds almost too simple, but it's backed by physics. If you can hear thunder, you are already within striking distance of the storm — lightning can travel more than 10 miles (16 km) from the parent cloud, sometimes striking under apparently clear skies far from the rain. This is the origin of the phrase "a bolt from the blue." There is no safe place outdoors during a thunderstorm. The moment you hear thunder, head for proper shelter.
Not all shelter is created equal. The two genuinely safe options during a thunderstorm are:
1. A substantial, enclosed building — one with wiring and plumbing, like a house, school, office, or store. These metal systems safely route a strike's electricity into the ground. A picnic shelter, dugout, bus stop, or tent does not count.
2. A fully enclosed metal-topped vehicle — a hard-topped car, truck, or van with the windows rolled up. Contrary to popular belief, it's not the rubber tires that protect you; it's the metal shell, which channels the current around the outside and into the ground. Convertibles, golf carts, and open cabs offer no protection.
Getting indoors is most of the battle, but lightning can still find its way in through wiring and pipes. While the storm is overhead:
• Stay off corded phones and electronics. A strike can send a surge through the line. Cordless phones and cell phones are fine.
• Avoid plumbing. Don't shower, bathe, or wash dishes — metal pipes and water can carry current.
• Keep away from windows and doors, and don't lean on concrete walls or floors, which often contain metal reinforcement.
• Unplug sensitive electronics before the storm arrives if you can; a surge protector won't stop a direct strike.
If you're stuck outside as a storm closes in:
• Get off high ground and away from isolated tall objects like single trees, poles, and towers — lightning tends to strike the tallest point.
• Get away from water. Leave pools, lakes, and the beach immediately; water is an excellent conductor and offers no protection.
• Drop metal objects you're carrying — golf clubs, umbrellas, fishing rods, hiking poles.
• Spread out if you're in a group, so a single strike can't injure everyone.
• Avoid open fields where you'd be the tallest thing around, and steer clear of sheds, dugouts, and bleachers.
The old advice to crouch in the "lightning position" has been dropped by safety experts — it doesn't meaningfully reduce your risk. Your energy is far better spent reaching a building or hard-topped car.
| The myth | The reality |
|---|---|
| Lightning never strikes the same place twice | It often does — the Empire State Building is hit around 25 times a year. |
| Rubber tires protect you in a car | It's the metal shell, not the tires, that routes the current safely around you. |
| You're safe if it's not raining | Bolts can strike 10+ miles (16+ km) from the rain, out of a blue sky. |
| Lightning victims carry a charge | They don't — it's safe and urgent to give first aid immediately. |
| A tree is good shelter | A tall, isolated tree is one of the most dangerous places to stand. |
A lightning-strike victim carries no electrical charge and is safe to touch. Acting fast saves lives:
1. Call 911 (or your local emergency number) immediately.
2. Check for breathing and a pulse. Many lightning deaths are from cardiac arrest, and prompt CPR is highly effective.
3. Begin CPR if needed and continue until help arrives.
4. Move the victim to safer shelter if more strikes are likely, but get them out of danger while treating them.
The best lightning safety happens before you ever leave the house. Thunderstorms are often in the forecast hours ahead, so check conditions before outdoor plans — hiking, golf, youth sports, yard work, or a day at the lake. Understanding the difference between a thunderstorm watch and a warning helps you judge how much lead time you have, and knowing what makes a storm turn severe — like the straight-line winds of a derecho — tells you when to take extra care.
Lightning is one of the few deadly weather hazards you can almost always avoid entirely. The whole strategy fits in one sentence: when thunder roars, go indoors — to a real building or a hard-topped vehicle — and stay there until 30 minutes after the last rumble. Most people who are struck either headed out too soon, came back too early, or thought they were safe because the rain hadn't started. Respect that distant first clap of thunder, check the forecast before you go, and lightning becomes a spectacle to admire from the window rather than a risk to your life.
→ Check the hourly forecast in your area on ClearCast before heading out