Supercell storm with frequent lightning, producing an EF3 tornado. The tornado is partially hidden by the dense shaft of rain. A tornado is a rapidly rotating funnel of air that can form below certain types of storm clouds. High wind speeds within the rotating funnel can cause immense destruction. An EF3 tornado is one in which wind speeds are between 220-270 kilometres per hour. These tornadoes are capable of damaging buildings, trees, cars and other heavy objects. This tornado was a large one, over a kilometre across. It was on the ground for around an hour. Filmed near Elmer, Oklahoma, USA, on 16th May 2015.