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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 .... Scientists have not yet created a complete definition of the word; for example, there is dis...

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 ... When these two air masses meet, they create instability in the atmosphere.

Tornado Story | How Tornadoes Form - Dangerous Weather

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

A funnel cloud is created. 3. The Funnel Rotates and Touches Down. The rain and hail in the thunderstorm cause the funnel to touch down creating a tornado.

How Tornadoes Form and Why They're so Unpredictable

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

May 11, 2015 ... Even then, "we still don't know why some thunderstorms create tornadoes while others don't," tornado-chaser Tim Samaras said in early 2013.

How Do Tornadoes Form? - Universe Today

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

Sep 18, 2016 ... Once a tornado has formed, it follows a predictable life cycle. First, the mesocyclone(rotating air), along with the rear flank downdraft( RFD), ...

www.ask.com/youtube?q=How Is a Tornado Created&v=lmWh9jV_1ac
Aug 19, 2014 ... Tornado Facts for Kids! - Duration: ... Tornado: What's the difference? ... Minecraft: EPIC TORNADO MOD (TIDAL WAVES, FLYING MOBS, AND ...

How is a tornado formed? | Reference.com

www.reference.com/science/tornado-formed-abe858f72610a66b

Tornadoes are formed when hot air and cold air meet in a powerful storm, and the warm air begins spiralling upward, creating a funnel cloud. This funnel cloud  ...

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

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

Apr 19, 2016 ... A large tornado touches down near Dallas on April 3, 2012. ... The rising warm air pushes the cold air beneath it, creating a rotating column that ...

How a tornado is formed - BBC

downloads.bbc.co.uk/news/nol/shared/spl/hi/sci-nat/06/tornado/pdf/how_tornado_is_formed.pdf

How a tornado is formed. Although no two tornadoes are the same, they need certain conditions to form - particularly intense or unseasonable heat. A storm ...