Why do tornadoes happen?

Answer

Tornadoes happen when warm, moist air masses and cold, dry air masses collide to cause large thunderstorms. Not all thunderstorms produce tornadoes, and scientists are not certain which factors are directly responsible for their formation. They do know that in many cases, horizontal spinning movements in the air can be lifted vertically. Once vertical, its base may span up to three miles from one side to the other.

While tornadoes are theoretically possible in any thunderstorm, they are far more common in the United States and Canada than any other country. They are especially common in a narrow slice of land called Tornado Alley. Tornado alley includes part of Kansas, Nebraska, Texas, South Dakota and Oklahoma. The reason that so many tornadoes occur in this area is that the Gulf of Mexico and Canadian tundra are found at each end. The Gulf of Mexico provides a constant source of warm, wet air, while the air flowing in from Canada is almost always cold and dry. The two air masses often collide over Tornado Alley, causing the frequent tornadoes.

Tornadoes are one of the most destructive forces in nature, and they can cause widespread damage and casualties. Tornadoes are ranked via a scale called the Enhanced Fujita Scale. Some tornadoes have had winds that exceeded 300 miles per hour.

Q&A Related to "Why do tornadoes happen?"
The National Climatic Data Center defines Tornado Alley as an area in the central plains ranging from central Texas to northern. Also included is the territory from central Kansas
http://www.ehow.com/info_8682136_tornado-alley-hap...
After a tornado, debris often litters the ground. Survey teams are sent to the damage to determine the rating and path length and width, while insurance firms assess the cost. If
http://wiki.answers.com/Q/What_happens_after_a_tor...
1. Observe: Look in the sky and look for funnel clouds. Or see if the sky is black. A black sky usually points to a tornado. Sometimes the the sky may turn purple or green. Ad. 2.
http://www.wikihow.com/See-if-There-Is-a-Tornado-H...
The most common places tornadoes happen in America is Tornado Alley. Tornado Alley is made up of four states. the states that make up Tornado Alley is. Texas, Oklahoma, Missouri,
http://wiki.answers.com/Q/Where_are_the_most_commo...
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