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Tornado Twisters



Tornado Twisters
Reading Level
     edHelper's suggested reading level:   grades 7 to 10
     Flesch-Kincaid grade level:   8.1

Vocabulary
     challenging words:    mesocyclone, thundercloud, ominous, supercell, tremendous, counterclockwise, violent, clockwise, mass, loss, visible, stage, produce, demand, southern, freight
     content words:    United States, Rocky Mountains, Appalachian Mountains, Tornado Alley, Enhanced Fujita Scale, Tristate Twister


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Tornado Twisters
By Sharon Fabian
  

1     A tornado is one of the most violent storms on Earth. It is a twisting, spinning mass of air that stretches from a thundercloud to the ground. A tornado can last anywhere from a few minutes to an hour or more. It can travel across the ground for less than a mile or over one hundred miles. The most violent tornadoes cause massive damage and the loss of many lives.
 
2     A tornado often occurs when warm, moist air meets cool, dry air. Many times, it begins in a thunderstorm cloud, often in the kind called a supercell. A supercell is a giant storm cloud that contains strong updrafts of wind and tremendous amounts of energy. When conditions are just right, these updrafts begin to spin. Then, if one of these spinning air masses tilts into a vertical direction, it is on its way to becoming a tornado. In this stage, the rotating air mass is called a mesocyclone. A mesocyclone can be two to six miles wide, and it has a good chance of escalating into a tornado.
 
3     To become a tornado, the air mass must stretch down from the thunderstorm cloud. When it does this, it becomes a funnel cloud. Once it touches the ground, it is a tornado. On the ground, the tornado continues to spin and also moves forward in the direction that the thunderstorm cloud is moving.
 
4     Some tornadoes appear as an ominous black twister and others appear to be bright white. At first, some tornadoes may be difficult to see, but once they begin to pick up dust and debris, they become much more visible.

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