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A funnel cloud may be called a condensation funnel or simply a funnel.
A funnel shaped cloud is called a funnel cloud. If it touches the ground it is called a tornado.
All funnel clouds touch the clouds. A funnel cloud that touched the ground is called a tornado.
The funnel cloud turned into a tornado.
Here are some sentences.
She saw a funnel cloud in the distance.
A tornado forms from a funnel cloud.