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It is usually just called a debris cloud or dust whirl.

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What is the name of the cloud of dust and broken materials that form at the bottom of a tornado?

This is referred to as the debris cloud.


What type of cloud rotates at the bottom of a thunderstorm and is a warning sign of a possible tornado?

A wall cloud, or, if a potential tornado is already developing, a funnel cloud.


What has a funnel and is at the bottom of a cumulonimbus cloud?

A tornado has a funnel and is at the bottom of a cumulonimbus cloud. If its winds do not reach the ground, though it is just a funnel cloud.


What is the bottom of tornado called?

There is no particular term for the bottom of a tornado. The base of a tornado may be shrouded in a debris cloud.


What occurs when a funnel cloud pokes through the bottom of a cloud and makes contract with the ground?

This is the birth of a tornado.


What type of cloud is in a tornado?

The cloud that forms the visible part of a tornado is called a funnel cloud.


Is the dark base of a tornado called the wall cloud?

No, the wall cloud is a lowered section of the cloud base from which a tornado or funnel cloud descends. The dark cloud at the base of a tornado is called the debris cloud.


What column of violently rotating air in the shape of a funnel that extends from the bottom of a cumulonimbus cloud to the ground?

This is called a tornado.


What do you call a tornado that does not touch the ground?

A tornado that does not touch the ground is a funnel cloud.


What does a tornado come out of?

A tornado usually emerges from a wall cloud, which is at the base of a cumulonimbus cloud.


What process keeps the funnel shape of a tornado?

The funnel of a tornado is caused by air decompressing and cooling as it enters the tornado, causing moisture to condense and form a cloud. As the air moves up it cools further, resulting in more condensation. This results in a cloud that is wider at the top than at the bottom.


Is a funnel cloud a tornado?

Not technically. It is the beginning of a tornado, but they are categorized differently. It is not considered a tornado until it reaches the ground with damaging winds.