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What Causes a Tornado? The swirling, funnel-shaped winds of a tornado are easily recognizableand they can be very dangerous. But what causes these unique and violent weather phenomena? Tornados usually begin with a thunderstorm. But not just any thunderstorma specific kind of rotating thunderstorm called a supercell. They can bring damaging hail, strong winds, lightning and flash floods. Supercells form when air becomes very unstable and wind speed and direction are different at different altitudes. This condition is called wind shear. Wind shear is common in the formation of most thunderstorms. But when wind at ground level is blowing in one direction and wind higher up in the atmosphere blows in a different direction it can cause a horizontal tube of air to form. In a thunderstorm, warm air rises up within the storm. This is called an updraft. An updraft can turn a horizontal rotating tube of air into a vertical one. When this happens, the whole storm begins rotating, creating a
