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Clouds form when water vapor condenses in the air. This releases heat, which increases the updraft temperature and the kinetic energy of air movement. In supercell thunderstorms, updrafts are strong and may create a vortex of air that may form a tornado.
Most scientists consider this to be a simplified and incomplete explanation. The finer details of tornado formation and dissipation are still unknown.

sciencing.com/causes-effects-tornadoes-8204458.html

Apr 25, 2017 ... A large thunderstorm that encounters certain atmospheric conditions can produce tornadoes, the large, fast-moving funnels of wind that cause ...

www.conserve-energy-future.com/types-and-causes-of-tornadoes.php

Types and Causes of Tornadoes: A tornado is a strong, turbulent column of air, ... area of the atmosphere and causes an invisible horizontal spinning effect in ...

www.quora.com/What-are-the-causes-and-effects-of-tornadoes

The primary "cause" of tornadoes is the physical law of conservation of angular momentum. If air is rotating slowly but is forced to converge to a smaller radius of  ...

www.weatherquestions.com/What_causes_tornadoes.htm

The intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm (caused by the unstable air) interacting with the wind ...

eschooltoday.com/natural-disasters/tornadoes/impact-of-tornadoes.html

What is a tornado How tornadoes form levels of tornadoes Effects of tornadoes ... destruction to homes, property, infrastructure and cause many deaths as well.

www.ask.com/youtube?q=Cause+Effects+of+a+Tornado&v=4ovHfKEnOmw
Feb 6, 2011 ... Join award winning teacher Jonathan Bergmann as he explains the causes and effects of tornadoes |Uploaded with TubeShack ...

www.livescience.com/21498-tornado-facts.html

Apr 19, 2016 ... Tornadoes are the most violent storms in nature. An average of 800 tornadoes are reported each year, resulting in 80 deaths and 1,500 injuries ...

www.eartheclipse.com/natural-disaster/various-causes-and-effects-of-torandoes.html

Tornadoes are violent, fast spinning columns of air that are in contact with both the earth's surface and the thunderstorm clouds high up in the sky. Tornadoes are ...

study.com/academy/lesson/what-are-tornadoes-definition-causes-the-enhanced-fujita-scale.html

Tornadoes are dangerous storms that affect millions of people. In this video lesson, you ... Hurricanes: Types, Formation, Causes & Effects. What is a Hurricane?