July 16, 2012

marconews.com - Hurricane 2012: Florida faces other weather risks, too

A tornado is a violent, rotating column of air extending from a thunderstorm to the ground. According to the National Oceanic and Atmospheric Administration, they cause about 80 deaths and more than 1,500 injuries a year.

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The revised scale was developed at Texas Tech University in conjunction with engineers, meteorologists and others from the National Oceanic and Atmospheric Administration, which is the umbrella agency for the National Weather Service.