There appears to be a great deal of information available about what makes a tornado start, but what makes them stop?
A tornado is defined as a strongly rotating column of air attached to the base of a thunderstorm and extending to the ground. Simply, tornadoes spin up beneath thunderstorms, and thunderstorms need a good supply of humid air to stay alive. But this moist flow doesn’t last forever and can easily be disrupted by other storms, or even the storm itself when rain falls and spreads cool air ahead of the storm. Without the updraft of warm humid air, the tornado’s spiraling winds unravel and weaken, and it falls apart. Movies of tornadoes in the past two decades have been extensively studied and most researchers agree on the tornado life cycle: formation stage, organization stage, mature stage, shrinking stage and decaying stage. The tornado begins to decay as the whirling column of air is stretched into a very thin tube. This is often referred to as the rope stage, when the tornado becomes very thin and begins “roping out.” It’s thought to occur when the burst of rain-cooled air on the storm’
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