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