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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.

How Do Tornadoes Form? - Dangerous Weather

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

Tornadoes are associated with large (supercell) thunderstorms that often grow to ... but one way the rotation appears to happen is when winds at two different ...

How Tornadoes Form | UCAR Center for Science Education

scied.ucar.edu/shortcontent/how-tornadoes-form

A tornado can form where winds blow at different speeds causing rotation (A) ... A horizontal rotating column of air can form at the boundary between these two ... and do not necessarily reflect the views of the National Science Foundation.

www.ask.com/youtube?q=How Does a Tornado Form?&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 ...

How Tornadoes Form and Why They're so Unpredictable

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

May 11, 2015 ... Tornadoes remain deadly and relatively unpredictable, despite recent advancements in weather science. Here's what scientists do know:.

Tornadoes - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-tornado.htm

How do tornadoes form? Most tornadoes form from thunderstorms. You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. When these ...

How Do Tornadoes Form? - Universe Today

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

Sep 18, 2016 ... The warm air eventually twists into a spiral and forms the funnel cloud that we all associate with a ... This is where the strongest tornadoes form.

How do tornadoes form? - eSchooltoday

eschooltoday.com/natural-disasters/tornadoes/how-do-tornadoes-form.html

Here is simple step by step description of how a tornado develops.

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

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

Apr 19, 2016 ... Tornadoes form when different temperatures and humidity meet. ... Do not touched downed power lines or anything in contact with such lines.

How do tornadoes form? - CNN.com

www.cnn.com/videos/tv/2015/04/02/orig-how-tornadoes-form.cnn

Apr 2, 2015 ... CNN meteorologist Jennifer Gray explains how tornadoes form and why they are one of the most dangerous weather phenomena on Earth.