 |
Opening windows to equalize air pressure will save a roof, or even a home, from destruction by a tornado. |
 |
Homes are damaged by strong winds, not air pressure changes. |
Even with the windows closed, most houses and commercial buildings have enough openings to vent the pressure difference in the time that it takes for a tornado to pass. Texas Tech's Institute for Disaster Research team reported that the pressure drop inside a tornado with 260 mph winds (F5 tornado) is only about 10%.
Most buildings can usually release this amount of pressure in just a few seconds using the the vents already built in the structure and is a sufficient time even if the tornado is moving forward at a very rapid, for example 60 mph. It is the the violent wind in a tornado that destroys the house not the buildup of air pressure inside the structure.
Leave the windows alone, the tornado will open them for you. Instead, immediately go to a safe place should a tornado threaten. Follow these safety rules... |
 |
In homes and small buildings, go to an interior part of the lowest level such as closets, bathrooms or interior halls. Get under something sturdy. |
 |
Don't even think about trying to escape from a tornado in your vehicle. A wind from a small F2 tornado can toss your car, and you, around like a piece of paper. Your are much, much safer in your house. |
 |
Avoid windows, doors and outside walls. |
 |
Abandon trailers and mobile homes and get into substantial shelter. If there is no shelter nearby, lie flat in a ditch or ravine with your hand shielding your head. |
|
