Air that enters a tornado spirals upward rapidly into the parent thunderstorm, becoming part of the main updraft. Some of this air may reach the upper troposphere where it will eventually be carried away by upper level winds. Some air may become part of the storm's downdraft and be dragged back to earth by rain.
No. While the funnel is made visible by condensation, it is mostly air.
The air pressure inside a tornado is very low.
Air near the ground spirals inward and upward in and near the tornado.
A tornado pulls in air that has become moist due mostly to rainfall. The rapid pressure drop inside the tornado cools the air, causing the moisture to condense and form a funnel shaped cloud.
The air pressure in a tornado is lower than that outside the tornado. That is why the wind blows toward the funnel.
In this case it can be confirmed that the tornado has touched down. The funnel of a tornado does not have to touch down for the tornado to do so, and the vortex actually reaches the ground before the funnel does. The circulation reaching the ground is a more significant event. When the vortex is aloft its updraft can draw in air from directly below. This is no longer possible when the circulation reaches the ground. Since air can no longer be drawn in from below the pressure inside the vortex drops, causing the wind in it to intensify.
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No. The funnel itself is made of condensation from the tornado sucking in moist air. In that sense it is much like an ordinary cloud.
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There are two components that make a tornado visible. The first is the condensation funnel or funnel cloud, which forms from moisture condensing inside the tornado. The other component is the debris cloud. This consists of dust and debris lifted into the air by the tornado's winds.