No, it is not safe to walk in a thunderstorm. There is no safe place outside during a thunderstorm, period. That’s the official position of the National Weather Service, and the physics behind lightning makes it clear why. Lightning kills about 20 people each year in the United States and injures hundreds more, and most of those casualties don’t come from direct strikes. They come from electrical current traveling through the ground, which means simply being outdoors and on your feet puts you at risk.
Why Walking Makes You Vulnerable
Most people picture lightning as a bolt hitting someone directly on the head. That’s actually the least common way people are hurt. Ground current is the leading cause of lightning casualties. When lightning strikes a tree, a pole, or even open ground, the electrical charge spreads outward along the surface. If you’re walking nearby, the current enters your body through the foot closest to the strike point and exits through the foot farthest away. The wider your stride, the greater the voltage difference between your two feet, and the more current passes through your body.
There are five distinct ways lightning can injure you, and four of them apply directly to someone walking outdoors. A side flash happens when lightning hits a tall object near you, like a tree, and part of the current jumps from that object to your body. Conduction occurs when current travels along metal surfaces like fences, railings, or utility lines you might be walking beside. And upward streamers, invisible channels of charge that rise from the ground toward an approaching lightning bolt, can injure or kill you even if the main bolt lands somewhere else. You don’t have to be the tallest thing around to be in danger.
Lightning Can Strike Before Rain Starts
One of the most dangerous misconceptions is that you’re safe as long the storm hasn’t arrived yet or has already passed. Lightning can travel 10 to 12 miles from the center of a thunderstorm. That means a bolt can strike from a nearly clear sky, well ahead of any rain. These “bolts from the blue” are why weather experts no longer rely on rain as a signal to seek shelter.
The practical rule: if you can hear thunder, you are within striking distance. Thunder is generally audible from about 10 miles away, though traffic, wind, and rain can reduce that range. Once you hear thunder, you should already be moving indoors. After the last rumble of thunder, wait at least 30 minutes before going back outside. Electrical charges linger in clouds long after a storm appears to have passed.
What Counts as Real Shelter
Not every structure protects you. Safe shelters include homes, office buildings, shopping centers, and hard-top vehicles with the windows rolled up. The metal frame of a car channels lightning around the exterior and into the ground, which is what makes it protective, not the rubber tires.
Structures that do not protect you from lightning include:
- Picnic shelters and gazebos
- Tents
- Baseball dugouts and open sports arenas
- Porches
- Convertibles, motorcycles, and golf carts
If a structure doesn’t have walls and a solid roof connected to a grounding system, or if it’s open on the sides, it offers essentially no protection. Standing under a tree is one of the worst choices you can make because side flash and ground current from a struck tree are responsible for a large share of lightning injuries.
Gear Won’t Protect You
Rubber-soled shoes do not insulate you from lightning. A bolt that has traveled miles through the atmosphere, which is a far better insulator than a thin layer of rubber, will not be stopped by your sneakers. Similarly, carrying a cell phone, wearing jewelry, or holding an umbrella with a metal shaft does not attract lightning. The three factors that determine where lightning strikes are height, pointy shape, and isolation. Metal on your body is irrelevant to whether you get struck.
That said, once lightning does strike, metal conducts electricity efficiently. So while your phone won’t draw a bolt toward you, leaning against a metal fence or standing near metal bleachers can channel a nearby strike’s current into your body. The takeaway: don’t waste time removing metal accessories when a storm is approaching. Spend that time getting to real shelter.
The Lightning Crouch No Longer Applies
For years, people were taught to crouch low with feet together if caught outside. The National Weather Service stopped recommending this position in 2008. Testing showed it simply doesn’t provide meaningful protection. Whether you’re standing upright or crouching, a lightning channel approaching from above will likely strike you either way. Worse, promoting the crouch gave people a false sense of security, making them less likely to seek actual shelter when they still had time.
If your hair stands on end or you feel a tingling sensation on your skin, a strike may be imminent. At that point there is no reliable action that will protect you outdoors. The only real strategy is to never let yourself reach that moment by heading inside as soon as you hear distant thunder or see darkening skies.
What Lightning Does to the Body
Lightning acts as a massive, instantaneous electrical shock that affects nearly every system at once. The primary cause of death is cardiac arrest: the current depolarizes the entire heart muscle simultaneously, disrupting its rhythm. It can also paralyze the muscles that control breathing. Survivors frequently experience neurological effects because the current can injure small blood vessels and nerve cells in the brain. Long-term heart and neurological problems are common among those who survive a strike.
The force of the strike itself, or the violent muscle contraction it triggers, can fracture bones, strain muscles, and cause internal injuries from being thrown. Lightning injuries are not like a mild electric shock from a household outlet. They involve currents of tens of thousands of amperes delivered in a fraction of a second.
A Practical Plan for Walkers
If you walk regularly, especially on trails or in open areas, checking the forecast before you leave is the single most effective thing you can do. Thunderstorms in many regions develop quickly in the afternoon, so morning walks carry less risk in storm-prone seasons. Plan your route so that a solid building or a car is never more than a few minutes away.
If you’re already outside when thunder starts, move toward a substantial building or a hard-top vehicle immediately. Avoid hilltops, open fields, bodies of water, and isolated tall objects like lone trees or light poles. If you’re in a group, spread out rather than clustering together, which reduces the chance of multiple people being injured by a single strike or ground current event. Every minute you spend deliberating outdoors is a minute you remain exposed to a hazard that no gear, posture, or footwear can mitigate.