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.
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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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