Why Do Tornadoes Occur?

Answer

Tornadoes occur when two masses of different temperatures and humidity collide. If there is unstable atmosphere at the lower area, then an upward movement of warmer air is formed. This leads to a strong spiral that rises and intensifies resulting in violent funnels of tornadoes.
Q&A Related to "Why Do Tornadoes Occur"
Tornadoes occur due to large pressure difference in two places. Heat of sun heats a place and its pressure gets decreased. So the air from high pressure region comes so rapidly in
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Tornadoes do not occur in polar regions, because the cold air does not provide enough energy. They do not occur in extreme desert regions because there is not enough moisture to fuel
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Typically, tornadoes develop several thousand feet above the earth's surface inside of a
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Tornadoes are the offspring of supercell thunderstorms. There are three conditions that must be met for a tornado to occur. They are: 1.) A northerly flow of marine tropical air from
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1 Additional Answer
Tornadoes occur when there is a supercell thunderstorm. They occur when there is a northern tropical air blowing from the gulf, cold air from Canada reaches over 50 miles per hour, and when jet stream air reaches a speed of 150 mph. You can find more information here: http://www.hprcc.unl.edu/nebraska/tornadoes-NDS99why.html
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