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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_preparedness

The term "tornado preparedness" refers to safety precautions made before the arrival of and during a tornado. Historically, the steps taken have varied greatly, depending on location, ... marked the bottom of a tornado even when the funnel was not visible. Tornadoes typically occur along the trailing edge of a thunderstorm.

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.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.bartlesvilleweather.com/tornado.html

Tornadoes are formed because there are certain conditions that are present. ... On this page there are three steps with drawings to explain how tornadoes form.

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

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

A funnel cloud is created. 3. The Funnel Rotates and Touches Down. The rain and hail in the thunderstorm cause the funnel to touch down creating a tornado.