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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 Facts: Causes, Formation & Seeking Shelter - LiveScience

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

Jul 10, 2012 ... Tornadoes are violent storms that kill 80 people each year. Here are some facts about how they form and how to stay safe.

What causes tornadoes?

www.weatherquestions.com/What_causes_tornadoes.htm

May 30, 2013 ... A description of the special conditions that can cause a thunderstorm to become tornadic.

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/

Basic information about tornadoes, from the NOAA National Severe Storms ... The rear flank downdraft is the motion in the storm that causes the hook echo ...

The Science of Tornadoes | Weather Underground

www.wunderground.com/resources/severe/tornadoFAQ.asp

A tornado is a violently rotating column of air which descends from a ... At the time of this radar scan, a tornado was on the ground. ... What causes tornadoes?

Tornado FAQs - About Tornadoes | Weather Underground

www.wunderground.com/resources/education/tornadoFAQ.asp

View More Tornado Photos ... What causes tornadoes? ... the updraft and the surrounding winds may cause the updraft to begin rotating-and a tornado is born.

Types and Causes of Tornadoes - Conserve Energy Future

www.conserve-energy-future.com/types-and-causes-of-tornadoes.php

Types and Causes of Tornadoes: A tornado is a strong, turbulent column of air, moving fast and keeping in contact with the earth's surface and a vertically ...

www.ask.com/youtube?q=What Causes a Tornado?&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!

What causes tornadoes? | MNN - Mother Nature Network

www.mnn.com/earth-matters/translating-uncle-sam/stories/what-causes-tornadoes

Apr 8, 2014 ... The U.S. has more tornadoes than anywhere else on Earth, but their sudden twists and turns still make them mysterious and mesmerizing.

Popular Q&A
Q: What causes a tornadoe?
A: Tornadoes form when horizontally rolling air gets turned vertical by thunderstorms. The updraft of the thunderstorm starts rotating and becomes a mesocyclone. U... Read More »
Source: wiki.answers.com
Q: What causes a tornado?
A: Tornado conditions are caused when different temperatures and humidity meet to form thunderclouds. In the United States, warm, wet winds from the Gulf of.MORE. ... Read More »
Source: www.kgbanswers.com
Q: What causes a tornadoe?
A: a tornado is a very destructive but short-lived windstorm in the form of a funnel shaped cloud that moves close to the ground destroying whatever is in its path... Read More »
Source: wiki.answers.com
Q: What causes a tornado?
A: While we're still not sure exactly "how" it happens, and why it happens sometimes and doesn't other times, we know that certain ingredients are needed to create... Read More »
Source: answers.yahoo.com
Q: What causes a tornado?
A: Most tornadoes form from thunderstorms. You need warm, moist air and cool, dry air. Read More »
Source: www.kgbanswers.com