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Gravity is present in a tornado, however, for objects that are not too heavy the upward flow of air in a tornado can overpower gravity. Tornadoes are dependent on convection, which requires gravity, but tornadoes themselves are a thermodynamic rather than gravitational event.
Gravity plays a role in the formation and behavior of tornadoes by influencing the movement of air masses and temperatures, which are key factors in tornado development. As warm air rises and cold air sinks due to gravity, it can create the necessary conditions for the rotation and intensification of a tornado.
The duration of a tornado can vary greatly, from a few seconds to several hours. On average, a tornado lasts for about 10 minutes. Tornado strength, size, and environmental conditions all play a role in determining how long a tornado will last.
Tornadoes usually form from a type of thunderstorm called a supercell, which has a rotating updraft called a mesocyclone. A downdraft at the back of the storm, called the rear-flank downdraft or RFD is believed to wrap around the tornado, tightening and intensifying it to produce a tornado.
Its the driving force.