| Factor | Windows | Windows Closed | | :--- | :--- | :--- | | Pressure Equalization | Minimal benefit; natural leakage already achieves this. | Sufficient; no dangerous differential accumulates. | | Internal Wind Speed | High-speed inflow creates internal vortex, lifting roof. | Zero internal wind from exterior. | | Debris Entry | Direct, unimpeded pathway for lethal missiles. | Blocked; glass may break but slows debris velocity. | | Structural Integrity | Severely compromised; internal pressurization aids collapse. | Maintained; wind flows around the envelope. | | Time Efficiency | Wastes 30–60 seconds hunting for windows. | Allows immediate sheltering. | | Risk of Injury | High (cuts from opening, debris entry, glass blow-back). | Low (broken glass stays mostly near window frame). |
Opening a window creates a direct pathway for high-velocity debris (2x4 planks, roofing shingles, broken glass, lawn furniture) to enter the living space. These missiles are the leading cause of injury and death during tornadoes, not pressure effects. should you open or close windows during a tornado
The primary destructive force of a tornado is not pressure, but . | Factor | Windows | Windows Closed |
If a tornado is approaching, leave the windows alone. The risk of structural damage comes from the sheer power of the wind and flying debris, not air pressure. | Zero internal wind from exterior
The preponderance of evidence from meteorological science, structural engineering, and empirical disaster research concludes that . There is no measurable safety benefit, and the practice significantly increases the risk of structural collapse, debris injury, and death.
While it is true that tornadoes have incredibly low pressure centers, the idea that a house will explode due to pressure differential is largely a myth.