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How does twister start?


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August 18, 2010 11:05PM

The process of tornado formation starts when rolling air called wind shear gets taken into the updraft of a thunderstorm. This turns the storm into a supercell, a storm with a strong, rotating updraft called a mesocyclone. Under the right conditions a downdraft can descend from the back of the storm, wrap around the mesocyclone, and force it into a tighter more intense vortex: the tornado itself.