The short answer is:
Keep windows closed . Prioritize seeking shelter, not opening or closing windows. should windows be open or closed during a tornado
During a tornado, you should . Contrary to common belief, opening windows does not help protect your home and can actually increase the risk of severe structural damage and personal injury. Debunking the Pressure Myth The short answer is: Keep windows closed
The old legend suggested that the low pressure inside a tornado would cause a house to explode due to the higher pressure inside the home. The theory was that opening windows would equalize the pressure and prevent the house from "exploding." Contrary to common belief, opening windows does not
Most tornado injuries happen after the storm when people walk through broken glass in bare feet. Safe Room Best Practices
A sealed house acts as a unified box. Once a window is opened, wind enters at high speeds, creating internal pressure that pushes up on the roof and out on the walls.
Instead of worrying about the windows, focus on these proven safety measures: