Do tornadoes form from shelf clouds?

How do clouds turn into tornadoes?

Inside thunderclouds, warm, humid air rises, while cool air falls–along with rain or hail. These conditions can cause spinning air currents inside the cloud. Although the spinning currents start out horizontal, they can turn vertical and drop down from the cloud–becoming a tornado.

What is an upside down tornado called?

A tornado consists of a funnel cloud with a rotating column of air that makes ground contact. … A rare type of funnel cloud known in the weather community as a horseshoe vortex, is a short-lived standalone funnel cloud that often looks like a moustache or upside-down U.

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