The key to understanding how tornadoes pull out roofs with ease is pressure. Your asphalt shingle may be rated to resist winds of up to 130 mph, but the uplift exerted by positive and negative pressures have other plans. While the tornado is pulling the roof, indoor pressure is pushing it up. According to the Whole Building Design Guide, depressurization reduces the force pushing the roof upward since the suction is drawing them elsewhere. This seems to suggest that it's good to open a window during a tornado. However, not only is it dangerous, it also won't be enough to counteract the tornado's immense forces.
http://brownsroofingcompany.com/rock-hill-sc-roofing-firms-urge-build-differently-tornado/
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