How do tornadoes form?

Answer

According to the National Oceanographic and Atmospheric Administration, tornadoes form when wind shear creates a rotation in an active storm system, and rising moisture-laden air shifts that rotation from a horizontal spin to a vertically spinning column. This rotation intensifies, creating a potentially devastating funnel cloud in the lower part of the storm.

Tornadoes can form quickly and without warning, so when conditions are favorable for tornado development, the National Weather Service issues watches to ensure that citizens in affected areas remain vigilant and prepared for potential dangers. Doppler radar systems provide detailed information about wind speeds and directions, so these systems can identify areas in a thunderstorm cell that may be developing the rotation that precedes a tornado's development. Identification of one of these distinctive "hook echoes" may be the only warning a community receives before the funnel cloud forms, and meteorologists often issue warnings based entirely off radar data without waiting for visual confirmation. Once a tornado forms, it usually only lasts for a few minutes, due to the incredible forces involved. However, the rotation that spawned the tornado may continue higher up in the cloud system, allowing a tornado to dissipate and re-form further along as the storm system moves through a region.

Q&A Related to "How do tornadoes form?"
Tornadoes can form when there are thunderstorms happening. The warm moist air can run into colder air. This will cause a disturbance and cause air to move faster. If the conditions
http://www.ask.com/web-answers/Science/Nature/how_...
The wind speeds up around a flat surface and form a circle shaped and is very harming/scary.
http://wiki.answers.com/Q/How+dose+a+tornado+form
For a tornado to form, two things are needed-a warm, humid air mass, and a cold, dry air mass. Thunderstorms usually contain large swells of warm air. When the warm air moves upward
http://www.ehow.com/how-does_4611128_tornado-start...
Warm moist air shoots upward, meeting colder, dryer air, making for a strong updraft!!
http://www.kgbanswers.com/how-does-a-tornado-form/...
1 Additional Answer
Ask.com Answer for: how does tornadoes form
The details of how and why tornadoes form and dissipate remain poorly understood. Most tornadoes last from a few seconds to a few minutes; only rarely do they last more than 10 minutes.
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