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Tornadoes form when unstable air in a thunderstorm creates a horizontal rotation in the clouds and strong downdrafts draw that vortex down to the ground. Overlapping fronts can tri...

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.



There are several scales for rating the strength of tornadoes. The Fujita scale rates tornadoes by damage caused and has been replaced in some countries by  ...

What causes tornadoes?


The intense spinning of a tornado is partly the result of the updrafts and downdrafts in the thunderstorm (caused by the unstable air) interacting with the wind ...

The important aspect of the definition is that the tornado or funnel cloud is in contact with the ground. While at first it would seem this is a consequence of the Coriolis effect , tornadoes are over almost as quickly as they start. In the United States, a unique com... More »
By Rachelle Oblack, About.com Guide

Severe Weather 101: Tornado Basics


The most common and practical way to determine the strength of a tornado is to look at the damage it caused. From the damage, we can estimate the wind ...

Tornado Facts: Causes, Formation & Seeking Shelter - LiveScience


Jul 10, 2012 ... An average of 800 tornadoes are reported each year, resulting in 80 deaths and 1,500 injuries. Let's take a look at what causes these ...

www.ask.com/youtube?q=What Causes Tornadoes&v=ep2YY_D7wdk
Dec 12, 2013 ... This is a Science Made Easy Video. A quick and fun cartoon lesson about tornadoes. Great for teachers and students- hope you guys enjoy!

Tornadoes - Weather Wiz Kids weather information for kids


A tornado is a violent rotating column of air extending from a thunderstorm to the ... Waterspouts can sometimes move inland, becoming tornadoes causing ...

What causes tornadoes? | MNN - Mother Nature Network - MNN.com


Apr 8, 2014 ... What causes tornadoes? The U.S. has more tornadoes than anywhere else on Earth, but their sudden twists and turns still make them ...

Popular Q&A
Q: What cause tornadoes?
A: Well a Tornado is caused when thunderstorm start rotating due to interaction with wind shear. This rotation can tighten, intensify, and extend towards the groun... Read More »
Source: wiki.answers.com
Q: What causes tornadoes?
A: From our video partners Birth Control Safe and effective options. Cool, dry air meeting warm, moist air When hot and cold air mixes it forms a funnel The warm a... Read More »
Source: wiki.answers.com
Q: What causes tornadoes?
A: Environment Canada describes tornadoes as a vortex of violently circulating winds that extends from the base of a cloud to the Earth's surface. The strongest to... Read More »
Source: www.cbc.ca
Q: What causes tornadoes?
A: Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability, and (2) wind shear present in the lower atmosphere. Read More »
Source: www.kgbanswers.com
Q: What causes tornado?
A: Tornadoes usually form over land rather than over tropical oceans, when there is warm, moist air near the ground and cold, dry air above it. These conditions oc... Read More »
Source: library.thinkquest.org