How Do Tornadoes Form?
8. Wall Clouds
Another type of cloud associated with tornadoes is the wall cloud. These can be quite visually striking as it causes the base of the cloud to drop closer to the ground. Wall clouds will also sometimes take the form of a funnel, giving it the appearance of a tornado. They form as a result of entrainment.
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It is a process that causes the air to become increasingly saturated with water and this causes more cloud to be formed. If the wall cloud is rotating then it indicates that a mesocyclone is present, and this is a sign that a tornado might be about to form.
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