Lightning strikes the Earth about 23.4 million times per year in the continental United States alone, and it follows predictable patterns when choosing its target. Tall, isolated, pointed objects are the most likely to be hit, but lightning can also reach open ground, water surfaces, and even travel inside buildings through wiring and plumbing. Understanding where lightning tends to strike helps explain both the physics behind each bolt and the real risks to people on the ground.
How Lightning Picks Its Target
A lightning bolt doesn’t simply shoot from cloud to ground in a single motion. It begins with an invisible, branching channel of negative charge called a stepped leader that zigzags downward from the storm cloud. As this leader approaches the ground, it triggers upward-reaching channels of positive charge from objects below, called upward streamers. These streamers tend to develop from the tallest objects beneath the leader’s path.
When the descending leader gets within about 50 meters of the ground or a grounded object, it connects with one of these upward streamers. That connection completes the circuit, and the massive discharge of electricity we see as a bright flash races back up the channel. This is why height matters so much: taller objects launch their upward streamers earlier and closer to the approaching leader, giving them a significant advantage in making that connection first.
What Gets Struck Most Often
Three physical characteristics make an object more likely to be hit: height, isolation, and pointedness. A lone tree in a field, a radio tower on a hilltop, or a person standing on a flat beach all share the same vulnerability. They’re the tallest thing around, which means they’re closest to the descending leader and most likely to produce a connecting streamer.
For tall structures like wind turbines, the frequency of lightning strikes increases proportionally to the square of the structure’s total height. That means doubling the height of a tower doesn’t just double the strike risk; it roughly quadruples it. The Empire State Building, for example, is struck dozens of times per year, thoroughly disproving the old saying that lightning never strikes the same place twice.
Pointedness also plays a role. Sharp, conductive tips concentrate the electric field and launch upward streamers more easily. This is the same principle behind traditional lightning rods: a pointed metal conductor on a rooftop attracts the strike and routes the current safely to the ground.
Lightning on Open Water
Water surfaces are excellent conductors, which makes open water one of the more dangerous places to be during a thunderstorm. When lightning hits water, the current spreads outward along the surface rather than plunging straight down. Research on lightning strikes to water found that the electrical energy disperses rapidly across the surface, with lethal current levels extending outward from the strike point.
The current doesn’t penetrate deeply into the water column in the way you might expect. Studies estimate that depositing even a small fraction of the lightning’s energy into the water body would require the electrical channel to penetrate at least 50 meters below the surface, which doesn’t typically happen. Instead, most of the danger is at and near the surface. If you’re swimming, wading, or in a small boat, the surface current can pass through your body between your two most widely separated contact points with the water.
How Lightning Reaches You on Land
A direct strike, where the bolt hits you on top of the head, is actually one of the less common ways people are injured by lightning. Ground current is the leading cause of lightning deaths and injuries. When a bolt hits a tree, a pole, or even flat ground, much of the energy fans outward along the ground surface. Anyone nearby becomes part of that electrical path. The current enters your body at the contact point closest to the strike and exits at the point farthest away, which is why the wider your stance, the greater the voltage difference across your body and the greater the danger.
Side flashes are another threat. When lightning hits a tall object like a tree, a portion of the current can jump from that object to a nearby person, essentially using their body as a shortcut. This typically happens when you’re standing within a foot or two of the struck object. It’s one reason sheltering directly under a tall tree during a storm is particularly risky.
Bolts From the Blue
Lightning doesn’t always fall from the darkest part of the storm directly overhead. So-called “bolts from the blue” can strike up to 10 miles away from any rainfall. These strikes originate from the upper regions of a thunderstorm and travel laterally before angling down to the ground, sometimes landing in areas where the sky appears partly clear. This is why lightning can be dangerous well before a storm arrives or after it seems to have passed.
Where Lightning Strikes Indoors
Buildings offer strong protection from lightning, but they’re not perfectly safe if you’re in contact with conductive pathways. Lightning enters structures three ways: through a direct strike to the roof, through outdoor wires or pipes that lead inside, or through the ground itself. Once inside the structure, the current can travel through electrical wiring, phone lines, plumbing, cable and antenna systems, and even metal reinforcement bars in concrete walls and floors.
This means activities like washing your hands, taking a shower, using a corded phone, or touching a plugged-in appliance during a thunderstorm carry real risk. Wireless devices not connected to a charger are safe, since they aren’t part of any conductive path. The danger is specifically about physical connections to metal systems that extend outside the building.
Where Strikes Are Most Common Geographically
Between 2017 and 2022, an average of 23.4 million cloud-to-ground flashes hit the continental U.S. each year, producing roughly 36.8 million individual ground strike points (since a single flash can fork and hit the ground in more than one spot). On average, each flash contacts about 1.57 separate points on the ground.
Central Florida has the highest lightning density in the United States, thanks to the daily collision of sea breezes from both coasts that fuels afternoon thunderstorms nearly every summer day. The Gulf Coast states, the southern Plains, and the Front Range of the Rockies also see heavy activity. By contrast, the Pacific Coast experiences relatively little lightning because the cool ocean water suppresses the intense convective storms that generate it. Globally, the tropics see the most lightning, with the Lake Maracaibo region of Venezuela and the Congo Basin in central Africa recording the highest flash rates on the planet.