How Tornadoes Form

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How Tornadoes Form
By Megan Mitchinson
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Tornadoes form inside thunderstorms. Dark,
often greenish sky large hail wall cloud a
loud roar, similar to a freight train. Some
tornadoes appear as a visible funnel extending
only partially to the ground.
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Before thunderstorms develop, a change in wind
direction and an increase in wind speed with
increasing height creates an invisible,
horizontal spinning effect in the lower
atmosphere.
Hot air from the ground rises
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This change can generate a horizontal spin in the
lower atmosphere. Down drafts bring the rotation
to the surface.
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Updrafts can tilt the rotating column of air from
horizontal to vertical causing it to spin
faster.