Tornado climatology
Tornadoes have been recorded on all continents except Antarctica and are most common in the middle latitudes where conditions are often favorable for convective storm development. The United States has the most tornadoes of any country, as well as the strongest and most violent tornadoes. A large portion of these tornadoes form in an area of the central United States popularly known as Tornado Alley. Other areas of the world that have frequent tornadoes include significant portions of Europe, South Africa, Philippines, Bangladesh, parts of Argentina, Uruguay, and southern and southeast Brazil, northern Mexico, New Zealand, and far eastern Asia.
Tornadoes of 1997
The 1997 Benton, Arkansas tornado outbreak was a major tornado outbreak that struck portions of the central and southern United States mostly on March 1, 1997, with initial activity on February 28. Affecting areas mostly from Arkansas to Kentucky, the two-day outbreak produced 39 tornadoes and killed at least 27 people including 25 in Arkansas alone with one death in each Mississippi and Tennessee.[2] This was Arkansas' deadliest tornado outbreak since May 15, 1968, where 34 were killed in Jonesboro.[3] Over 400 others were injured during this event which was about 45% of the yearly average of tornado-related injuries in the United States.