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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.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 ...

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

www.wunderground.com/prepare/tornado

How do tornadoes form? The truth is that scientists don't fully understand how tornadoes form. A parent supercell thunderstorm is needed. Beyond that, each ...

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:.

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 tornado. The formation of a tornado follows a ...

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

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

www.popularmechanics.com/science/environment/a15633/how-a-tornado-forms-in-4-steps

May 19, 2015 ... Warm, moist air, usually from the south, is lifted by a warm or cold front, causing an updraft. The moisture condenses into clouds and ...