what is the exact definition of a tornado?

Question

what it is , as the scienctific definiton

Answer 1

According to the Glossary of Meteorology (AMS 2000), a tornado is "a violently rotating column of air, pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud." Literally, in order for a vortex to be classified as a tornado, it must be in contact with the ground and the cloud base. Weather scientists haven't found it so simple in practice, however, to classify and define tornadoes. For example, the difference is unclear between an strong mesocyclone (parent thunderstorm circulation) on the ground, and a large, weak tornado. There is also disgreement as to whether separate touchdowns of the same funnel constitute separate tornadoes. It is well-known that a tornado may not have a visible funnel. Also, at what wind speed of the cloud-to-ground vortex does a tornado begin? How close must two or more different tornadic circulations become to qualify as a one multiple-vortex tornado, instead of separate tornadoes? There are no firm answers.

Answer 2

A tornado is defined by the Glossary of Meteorology as "a violently rotating column of air, in contact with the ground, either pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud..."[6]

Answer 3

Tornadoes are rapidly rotating columns of air that extend down, in a funnel-shaped form, from the base of a thunder cloud to the gound.They range from several metres to several hundred metres in diameter.Some last for a number of hours and can travel hundreds of miles.

Answer 4

a localized, violently destructive windstorm occurring over land, esp. in the Middle West, and characterized by a long, funnel-shaped cloud extending toward the ground and made visible by condensation and debris.