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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.

Tornado - Wikipedia

en.wikipedia.org/wiki/Tornado

Formation. As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm.

How Do Tornadoes Form? - Universe Today

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

Sep 18, 2016 ... Once a tornado has formed, it follows a predictable life cycle. First, the mesocyclone(rotating air), along with the rear flank downdraft( RFD), ...

Tornado Formation - Windows to the Universe

www.windows2universe.org/earth/Atmosphere/tornado/formation.html

Apr 29, 2016 ... RSS Feeds. Atmospheric conditions typical during tornado formation. ... A tornado begins in a severe thunderstorm called a supercell.

Severe Weather 101: Tornado Basics

www.nssl.noaa.gov/education/svrwx101/tornadoes/

Tornado formation is believed to be dictated mainly by things which happen on the storm scale, in and around the mesocyclone. Recent theories and results ...

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

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

Apr 19, 2016 ... Tornadoes are violent storms that kill 80 people each year. Here are some facts about how they form and how to stay safe.

www.ask.com/youtube?q=Formation of a Tornado&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 a tornado is formed - BBC

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 ...

How Tornadoes Form and Why They're so Unpredictable

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

May 11, 2015 ... The supercell churns high in the air and, in about 30 percent of cases, it leads to the formation of a tornado below it. This happens when air ...

How do tornadoes form? - eSchooltoday

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

tornado tips Step 6: The tornado is fully formed now and moving in the direction of the thunderstorm winds. When the pointed part of the tornado touched the ...