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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.

Tornado - Wikipedia

en.wikipedia.org/wiki/Tornado

A tornado is a violently rotating column of air that spins while in contact with both the surface of ... The Fujita scale rates tornadoes by damage caused and has been replaced in some countries by ...

Tornado Facts: Causes, Formation & Seeking Shelter - Live Science

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

Apr 19, 2016 ... Tornado wind and debris cause most of the structural damage suffered, but nearly half of the injuries from such disasters occur after the tornado ...

Tornadoes - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-tornado.htm

A tornado is a violent rotating column of air extending from a thunderstorm to the ... Waterspouts can sometimes move inland, becoming tornadoes causing ...

www.ask.com/youtube?q=What Creates 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 ...

What causes tornadoes?

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 ...

How Do Tornadoes Form? - Universe Today

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

Sep 18, 2016 ... The formation of a tornado follows a clear set of steps. ... This change occurs at an increasing altitude and creates an invisible horizontal ...

How Tornadoes Form and Why They're so Unpredictable

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 ... Half of those deaths are caused by the strongest one percent of the most ...

What causes a tornado to form? | Reference.com

www.reference.com/science/causes-tornado-form-4c866daf4cf70df

According to the National Oceanographic and Atmospheric Administration, tornadoes form when warm air creates a rotating updraft in a powerful thunderstorm.

Tornado Story | How Tornadoes Form - Dangerous Weather

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

Tornadoes are associated with large (supercell) thunderstorms that often grow to ... and hail in the thunderstorm cause the funnel to touch down creating a tornado .