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Every summer, as thunderstorms roll across the Midwest and tornado sirens wail through the Plains, a familiar set of old wives’ tales resurfaces right alongside them. Some of these ideas got passed down from grandparents who meant well. Others came from half-remembered science class lessons that never quite stuck the right way.
The trouble is that a few of these myths are not just wrong, they are actually dangerous when severe weather hits. Here are eight of the most persistent weather misunderstandings still circulating across the country, along with what meteorologists and safety officials actually say about them.
1. Opening windows before a tornado equalizes pressure
This one has been around for generations, the idea that cracking open your windows before a tornado arrives will somehow save your roof from being ripped off. The theory goes that a sudden pressure drop inside a sealed house causes it to explode outward, so opening a window is supposed to relieve that stress. It sounds plausible on paper, which is probably why it has survived so long, but it was believed that the sudden drop in atmospheric pressure during a tornado would cause a sealed house to explode outward, however, that is entirely false.
In reality, even the most powerful tornadoes do not drop the air pressure low enough to cause a house to explode. What actually destroys homes is far more straightforward: wind and flying debris. It’s actually violent winds that breach a home, blow the roof and walls inward and cause the rest of the structure to collapse outward. Worse, stopping to open windows just wastes precious seconds you should be spending getting to shelter, and opening windows wastes time needed to seek shelter and invites damaging winds into your home.
2. Tornadoes can’t cross rivers or climb mountains
People in hilly or river valley towns have long told themselves that local geography offers a kind of natural shield against tornadoes. It is a comforting thought, but it simply is not supported by the record. No geographical feature can stop a tornado, they can cross rivers, roar through valleys, travel up mountains, and strike major metropolitan areas with ease.
History backs this up in dramatic fashion. The catastrophic Tri-State Tornado of 1925, the deadliest in U.S. history, famously crossed both the Mississippi and Wabash Rivers. Tornadoes have also touched down inside city limits and rolled over ridgelines that many assumed would break them apart. The myth persists partly because certain regions really do see fewer tornadoes, but that has more to do with atmospheric conditions than any protective terrain.
3. Highway overpasses are safe tornado shelters
This myth got a boost from television footage decades ago showing people who survived a tornado while huddled under an overpass, and the image stuck in the public imagination. What that footage did not show was how much luck was involved, or how many others have been hurt trying the same thing since. Overpasses do not protect people from tornado winds, and in fact they can make things worse because overpasses can concentrate the tornado winds, causing them to be significantly stronger, which places the people under them in an even more dangerous situation.
Emergency management officials have documented real consequences from this belief. In recent years, several people seeking shelter beneath overpasses have been killed or severely injured. The safer move if you are caught driving during a tornado warning is different than most people assume. The National Weather Service advises abandoning your car for a sturdy building, or lying flat in a low ditch away from your vehicle while covering your head as a last resort.
4. The southwest corner of a building is the safest spot
This particular piece of folklore has an oddly long paper trail. The idea that the southwest corner of a structure is the safest place in a tornado was first published in the 1800s and persisted until the 1990s despite being thoroughly debunked in the 1960s and 1970s. The original logic assumed tornadoes always moved from southwest to northeast, so debris would supposedly pile up on the opposite side of the building.
Modern research shows tornado paths are far less predictable than that old assumption allowed for. The actual recommendation today has nothing to do with compass direction. The safest place in a building is in a small, reinforced room, such as a bathroom or closet, near the center of the building on the lowest floor. Being away from exterior walls and windows matters far more than which corner you happen to choose.
5. Heat lightning is a harmless, separate kind of lightning
Ask almost anyone who grew up watching flickers of light on a hot summer night with no accompanying thunder, and they will probably tell you they witnessed heat lightning. It is one of the more charming weather myths, partly because it feels rooted in a kind of backyard folk wisdom passed down for decades. According to the National Weather Service, the term heat lightning is commonly used to describe lightning from a distant thunderstorm just too far away to see the actual cloud-to-ground flash or to hear the accompanying thunder, and while many people incorrectly think that heat lightning is a specific type of lightning, it is simply the light produced by a distant thunderstorm.
The visual effect happens because of basic physics rather than heat itself. Often, mountains, hills, trees or just the curvature of the earth prevent the observer from seeing the actual lightning flash, and instead the faint flash seen by the observer is light being reflected off higher-level clouds. That storm producing the flicker could still be moving your way, which is exactly why forecasters caution against treating heat lightning as a sign of safety.
6. Lightning never strikes the same place twice
This saying gets used so casually in everyday conversation that most people never stop to question whether it is even meteorologically accurate. It is not. Lightning often strikes the same place repeatedly, especially if it’s a tall, pointy, isolated object.
New York City offers one of the clearest examples of just how wrong this myth really is. The Empire State Building is hit an average of 23 times a year. Tall structures, isolated trees, and metal towers act like magnets for repeated strikes precisely because of their height and shape, not despite it. The saying likely survives simply because it sounds tidy and reassuring, even though nature does not work that way.
7. Rubber tires or rubber-soled shoes protect you from lightning
This is one of the more mechanically minded myths, built on the assumption that rubber acts as a reliable insulator against something as powerful as a lightning bolt. The reasoning falls apart quickly when you consider the actual voltages involved. Rubber-soled shoes and rubber tires provide NO protection from lightning.
There is a real safety benefit to being in a car during a storm, but it has nothing to do with the tires. The steel frame of a hard-topped vehicle provides increased protection if you are not touching metal. The metal shell essentially channels the electrical current around the occupants and into the ground, a principle closer to a Faraday cage than anything related to rubber insulation.
8. Sheltering under a tree keeps you safe during a thunderstorm
Ducking under a tree during a sudden downpour feels instinctive, almost primal, and it is one of the oldest weather habits people fall back on. Unfortunately, this instinct runs directly counter to lightning safety guidance. Being underneath a tree is the second leading cause of lightning casualties, and it is better to get wet than fried.
Trees, especially tall or isolated ones, tend to attract lightning strikes for the same reasons skyscrapers do. When lightning hits a tree, the current can travel outward through the ground or leap sideways to anyone standing nearby, a phenomenon meteorologists call a side flash. The safest option during a thunderstorm remains getting into a substantial building or hard-topped vehicle rather than trusting any form of outdoor cover.
Weather folklore tends to stick around because it often contains a grain of old, half remembered science, dressed up in language that sounds convincing. The problem is that these eight myths are not just quirky trivia. Several of them, particularly the ones involving tornadoes and lightning, have led people to make choices that put them in real danger during actual severe weather events. Knowing the difference between inherited wisdom and current forecasting science is one of the simplest ways to stay safer the next time storm warnings start flashing across a phone screen.
