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?"
In the United States, the battle between cool Canadian air and warm, moist air from the south often leads to tornadic storm development. Especially during spring and early summer,
http://www.ehow.com/info_8698939_causes-tornadoes-...
The most likely place in the whole world is a place called the Tornado Alley. It is located down the middle of the United Sates, and the states that are included in the Tornado Alley
http://wiki.answers.com/Q/Where_is_it_likely_to_fo...
Tornadoes used to be classified according to the. Fujita Scale. Developed by Ted Fujita and his wife in 1971, the scale has been a famous general marker for how intense a tornado
http://weather.about.com/od/tornadoe1/ss/tornadoes...
Tornadoes formation starts like this: A change in wind direction and increase in speed
http://www.chacha.com/question/how-are-tornadoes-f...
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.
Explore this Topic
When warm air goes up at a rapid pace and cool air remains at the earth's surface, a tornado can form depending on winds coming from two different directions. Tornadoes ...
Tornadoes form when conflicting weather fronts meet up. When hot dry winds and cold moist air meet up, they begin to blow against each and cause circular motion ...
When warm southern winds try to rise, the cold northern air blocks them. They hit each other, causing the warm trapped air to rotate horizontally between the ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com