ROGER HILL / SCIENCE PHOTO LIBRARY ROGER HILL / SCIENCE PHOTO LIBRARY
Tornado over fields. This tornado was on the ground for over 30 minutes and was measured as an EF3 on the Enhanced Fujita (EF) scale. The EF scale measures the power of tornadoes and runs from 0 to 5, with 5 being the most powerful. Photographed near Silverton, Texas, USA, on 28th March 2009.
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