Yes, it must extend from cloud base to the ground.
In North America a swirling column of sand is called a dust devil. It resembles a tornado in appearance but does not extend to a cloud base and the winds are not nearly as strong.
A narrow funnel shaped column of spiraling winds is called a tornado. Tornadoes are a type of severe weather phenomenon characterized by their violent swirling motion and destructive force.
A tornado is primarily composed of rotating air that forms a violently swirling column extending from a thunderstorm to the ground. This rotating air can reach extremely high wind speeds and is capable of causing significant damage.
Tornado
tornado
This is a tornado, a violent rotating column of air that extends from a thunderstorm to the ground. Tornadoes are capable of causing significant damage and are associated with severe weather conditions.
A tornado is considered a tornado when a rotating column of air descending from a thunderstorm cloud reaches the ground, causing damage and visible debris swirling in a vortex. The National Weather Service confirms tornadoes based on eyewitness reports, damage assessment, and radar data.
In most cases in the northern hemisphere, air spirals counter-clockwise around a tornado and sucks upward in the core center of the tornado. This is typically clockwise in the southern hemisphere.
It is a tornado.
That would be a tornado. It is a rapidly rotating column of air that extends from a thunderstorm to the ground. Tornadoes are capable of causing extensive damage with their high wind speeds.
Yes. If a tornadic vortex does not make contact with the ground it does not meet the defintion of a tornado, and is simply called a funnel cloud. If the violent circulation (not necessarily the visible funnel) reaches the ground it is considered a tornado.
There is no particular term for the bottom of a tornado. The base of a tornado may be shrouded in a debris cloud.