Tornado

A Tornado is a rapidly rotating column of air that is in contact with both a comulonimbus cloud and the surface of Earth. They come in many shapes and sizes, but are typically in the form of a visible condensation funnel originating from the base of a large storm cloud, whose end touches the ground and is often encircled by a basal cloud of dust and debris. Most tornadoes have wind speeds less than 110 miles per hour or 180 km/h, are about 250 feet (80 m) across, and travel several miles before dissipating.