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The United States receives more than 1,200 tornadoes annuallyâfour times the amount seen in Europe. Violent tornadoesâthose rated EF4 or EF5 on the Enhanced Fujita Scale âoccur more often in the United States than in any other country. Most tornadoes in the United States occur east of the Rocky Mountains. The Great Plains, the Midwest, the Mississippi Valley and the southern United States are all areas that are vulnerable to tornadoes. They are relatively rare west of the Rockies and are also less frequent in the northeastern states.
Tornadoes have been observed on every continent other than Antarctica but there are areas which have a higher occurrence than others. The US has the most tornadoes annually, normally between 800-1000 a year; many of these occur in 'Tornado Alley', this area includes the states of Oklahoma, Texas, Kansas, Nebraska. tornado is defined as a 'violently rotating column of air which is in contact with the ground' (NWS). The word tornado is derived from the Spanish word tornar (to turn) and the Spanish word tronada (thunderstorm).