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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.
Which tornados occur most often weak strong or violent? Weak tornadoes (EF0 and EF1) are by far the most common accounting for 89% of all tornadoes. Strong tornadoes (EF2 and EF3) are next, accounting for about 10% of tornadoes.Fi â¦ nally come violent (EF4 and EF5) tornadoes, which account for less than 1% of all tornadoes.arm moist air from the Gulf of Mexico frequently moves over the region from the south. This col â¦ lides with cool air from Canada and dry air from the Rockies. This collisions of air mass is often triggers thunderstorms, often very strong ones. The region also frequently gets strong wind shear.