Transcript Tornadoes, nearly three-quarters of which occur within the U. New tools and data are helping scientists learn more about when they might form and what paths they might take. But what exactly is a tornado and how does it form? Exactly how and why tornadoes occur is still a bit of a mystery, but an indication that one is forming is a wall cloud. Fast-moving winds roll air below into a horizontal vortex—a spinning tube—above opposing surface winds.
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Tornadoes have been observed in all 50 U. Late comer The latest that the first tornado of the year has ever been recorded was on Feb. The record holder for any May is May , with confirmed tornadoes. Measuring damage The strength of tornadoes is measured on the Enhanced Fujita scale , which rates tornadoes based on the damage they cause. The ratings on the scale, which run from EF-0 to EF-5, correspond roughly to the strength of the winds seen in the twister. The original Fujita scale was developed by meteorologist Ted Fujita and attempted to relate tornado damage to the wind speeds that caused the damage, as the present EF scale does, but it didn't take into account the fact that winds affect different structures in different ways.
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Xenia Tornado April 3, Xenia Tornado The tornado superoutbreak of April , resulted in tornadoes in 13 states. Across the United States, people were killed, more than 6, injured, and 27, families suffered property losses.