Tornadoes are natures most violent storm. They are formed by very powerful thunderstorms. When warm moist air and dry cold air meet, they create instability in the atmosphere. It begins as a rotating funnel-shaped cloud that extends from a thunderstorm cloud base. Most of the time, tornadoes take on the appearance of a narrow funnel but it can vary according to the climate conditions. They can strike with little or no warning at all. Tornadoes have been seen on every continent except Anartictia
The deadliest tornado in U.S history was the tri-state tornado. It killed over 700 people. It was on March 18, 1925. It went through Missouri, Illinois, and Indiana. It was a part of a larger tornado outbreak. 2,298 people were injured. It was terrifying for several people.