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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 and a cumulonimbus cloud or, in rare cases, the base of a cumulus ...

.ask.com/youtube?q=How+Is+a+Tornado+Made&v=lmWh9jV_1ac&vl=en
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 ...

www.weatherwizkids.com/weather-tornado.htm

Tornadoes What is a tornado? A tornado is a violent rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable ...

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 humid air will begin to rise very quickly. 1.

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

May 11, 2015 ... A tornado lowers to the ground near Chickasha, Oklahoma, on May 6. May and June tend to have more tornadoes than any other months in ...

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 ... gets paid commissions on purchases made through our links to retailer sites.

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

Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes are the most ...

www.ducksters.com/science/earth_science/tornadoes.php

Kids learn about tornadoes including how they form, characteristics, types including supercell and waterspout, categories, and fun facts.

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

Sep 18, 2016 ... The formation of a tornado follows a clear set of steps. ... Lastly, with the tornado's warm air supply cut, the vortex begins to weaken and shrivel ...