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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.

en.wikipedia.org/wiki/Tornado

A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth ... However, the vast majority of tornadoes occur in the Tornado Alley region of the United States, although ..... Tornadic storms do not contain more lightning than other storms and some tornadic cells never produce lightning at all.

www.ask.com/youtube?q=How+Does+a+Tornado+Form%3F&v=lmWh9jV_1ac&vl=en
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 ...

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 ...

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.

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

May 11, 2015 ... Here's what scientists do know: A tornado, or twister, is a violently rotating column of air that extends between the Earth's surface and a cloud, ...

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 ...

ed.ted.com/lessons/how-do-tornadoes-form-james-spann

Tornadoes are the most violent storms on Earth, with wind velocities that can exceed 200 miles per hour. How do these terrifying cyclones form? Meteorologist .

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

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

www.scientificamerican.com/video/how-do-tornadoes-form2013-04-23

Oct 16, 2014 ... Every year tornadoes rip through the U.S. Midwest, leaving death, injury and billions of dollars of damage in their wake. Where do these ...