What is a tornado and how does it form?

A tornado looks like the sky reached down and decided to dance — a spinning rope of cloud, twisting across the ground, kicking up dust and noise. It's wild and a little scary. But underneath all that drama, a tornado is really just air doing something air does all the time: moving. The trick is figuring out what makes ordinary air decide to spin so hard it becomes a funnel.
It all starts with a special kind of storm called a supercell. Picture a normal rain cloud, then make it enormous — taller than mountains, dark and full of energy. Tornadoes don't pop out of every storm. They come from these big, towering thunderstorms, the giants of the sky. So before there's a tornado, there's a storm so large it has its own weather brewing inside.
