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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 ...

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.

.ask.com/youtube?q=What+Makes+a+Tornado&v=lmWh9jV_1ac
Aug 19, 2014 ... View full lesson: http://ed.ted.com/lessons/how-do-tornadoes-form-james-spann Tornadoes are the most violent storms on Earth, with wind ...

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

May 11, 2015 ... How Tornadoes Form and Why They're so Unpredictable ... "Then the updraft tends to rotate, and that makes a supercell," explains Brooks.

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

May 19, 2015 ... Warm, moist air, usually from the south, is lifted by a warm or cold front, causing an updraft. The moisture condenses into clouds and ...

www.universetoday.com/75695/how-do-tornadoes-form

Sep 18, 2016 ... The formation of a tornado follows a clear set of steps. First there ... Lastly, with the tornado's warm air supply cut, the vortex begins to weaken and shrivel away. As the ... Close Help make Universe Today better today! See no ...