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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.

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 ...

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

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

Apr 19, 2016 ... Tornadoes are violent storms that kill 80 people each year. Here are some facts about how they form and how to stay safe.

www.ask.com/youtube?q=What Causes Tornadoes&v=ep2YY_D7wdk
Dec 12, 2013 ... This is a Science Made Easy Video. A quick and fun cartoon lesson about tornadoes. Great for teachers and students- hope you guys enjoy!

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 ...

Severe Weather 101: Tornado Basics

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

How is tornado strength rated? The most common and practical way to determine the strength of a tornado is to look at the damage it caused. From the damage ...

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.

What Causes Tornadoes? | The Weather Guys

wxguys.ssec.wisc.edu/2011/05/01/what-causes-tornadoes/

May 1, 2011 ... We don't know if a particular storm will produce a tornado so the truth is we really don't know what causes a tornado. We do know the ...

WHAT CAUSES TORNADOES AND HURRICANES?

www.theweatherprediction.com/basic_weather_questions/tornadoes_hurricanes.html

A tornado is rapidly spinning air that develops from a thunderstorms and is ... This rising air is what causes all the rain and hail to form from the water in the air.

What Causes Tornadoes? | Science 2.0

www.science20.com/news_articles/what_causes_tornadoes

Jun 7, 2010 ... A tornado is a rotating column of air extending from a thunderstorm to the ground. Tornadoes are capable of 250 MPH wind speeds, cutting a ...