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How does a tornado form?

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Tornados need moisture to fuel them. The first stage of a tornado is when the supercell has formed. The next part of a tornado is when the vortex has formed. The vortex eventually turns into a mesocyclone. These are the stages but how does this happen? Warm air comes from the ground while the cold, moist air comes from the storm. When they meet on the ground the warm air gets pushed by the cold, moist air because the cold air is denser. By Molly
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