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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.

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 ...

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

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

www.ducksters.com/science/earth_science/tornadoes.php

Kids learn about tornadoes including how they form, characteristics, types including supercell ... The typical steps for the formation of a tornado are as follows:.

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 ... The formation of a tornado follows a clear set of steps.

www.conserve-energy-future.com/how-do-tornadoes-form.php

How Do Tornadoes Form? A tornado is a strong, ... The formation of tornadoes is followed in a set pattern of simple steps. Firstly, when the thunderstorm ...

www.pbslearningmedia.org/resource/ess05.sci.ess.watcyc.downdraft/how-do-tornadoes-form

On average, about 800 tornadoes occur in the United States each year. ... since some of the factors that trigger the last steps of tornado formation aren't known, ...

.ask.com/youtube?q=Steps+How+Tornadoes+Form&v=cvOut9VUqKY
Feb 25, 2011 ... I found this interesting video about how tornadoes from kinda cool =)

downloads.bbc.co.uk/news/nol/shared/spl/hi/sci-nat/06/tornado/pdf/how_tornado_is_formed.pdf

How a tornado is formed. Although no two tornadoes are the same, they need certain conditions to form - particularly intense or unseasonable heat. A storm ...

.ask.com/youtube?q=Steps+How+Tornadoes+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 ...