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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.

en.wikipedia.org/wiki/Tornado

A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth ..... Landspouts also create a distinctively laminar cloud of dust when they make contact with the ground, due to their differing mechanics from true ...

news.nationalgeographic.com/2015/05/150511-tornadoes-storms-midwest-weather-science

May 11, 2015 ... A tornado, or twister, is a violently rotating column of air that extends between ... " Then the updraft tends to rotate, and that makes a supercell," ...

www.ask.com/youtube?q=What+Makes+a+Tornado&v=lmWh9jV_1ac&vl=en
Aug 19, 2014 ... Meteorologist James Spann sheds light on the lifespan of tornadoes as ... You gather a bunch of airbenders in one area and make them bend ...

www.weatherwizkids.com/weather-tornado.htm

A tornado is a violent rotating column of air extending from a thunderstorm to the ground. .... Make sure everyone knows where to go in case a tornado threatens.

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.eo.ucar.edu/kids/dangerwx/tornado3.htm

Tornadoes are associated with large (supercell) thunderstorms that often grow to over 40,000 feet. A column of warm ... Faster Spin Makes a Funnel Cloud.

www.popularmechanics.com/science/environment/a15633/how-a-tornado-forms-in-4-steps

May 19, 2015 ... As air rushes in to equalize the pressure, a tornado is formed. ... Tornadoes can form anywhere, at any time of year, but most occur between April and July, either in the Southeast or a ... What Makes a Mountain a Mountain?

www.weatherquestions.com/What_causes_tornadoes.htm

Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. Instability refers to  ...

www.nssl.noaa.gov/education/svrwx101/tornadoes

Basic information about tornadoes, from the NOAA National Severe Storms ... This makes it possible to express ratings in terms of one scale to the other, ...