Most experts agree that waiting until you've heard a tornado's signature jet engine roar is a recipe for disaster. With only five to 13 minutes of advanced warning possible using current technology, your best bet is to seek shelter at the first hint of danger. By the time you hear the churning vortex of a twister, it's often too late.
Unbeknownst to many, however, is that tornadoes and the storms that spawn them generate something called infrasound. These sound waves have frequencies below 20 hertz (cycles per second) or beyond the lower limit of human audibility. Infrasound stations have been created around the world to monitor both man-made events (such as nuclear explosions and sonic booms) and natural events (such as earthquakes, volcanic eruptions and avalanches).
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