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What percentage of the world's tornadoes occur in the US?
Per the CIA World Factbook 6/19/08: the U.S. population is 303,824,646 the world population is 6,677,563,921 That means that the U.S. accounts for 4.55% of the wor…ld population.
In short, the Central United States has just about the perfect climate for producing tornadoes. The long version: Most strong tornadoes in the U.S. occur between the… Rockies and the Appalachians, particularly on the Great Plains in a region called Tornado Alley. In the region between the two mountain ranges cold air from Canada collides with warm, moist air from the Gulf of Mexico, forming a cold front. The cold front lifts the warm, moist air, sparking the development of thunderstorms. In Tornado Alley a mass of dry air from the Rockies may also move in, forming a dry line. This can also generate thunderstorms and can be even more conducive for the formation of strong tornadoes than a cold front. Activity is especially intense at the triple point, where a dry line intersects a cold front Other key factors come into play as well. There is a layer of stable air about 6,000 feet above the ground called a cap, which initially prevents thunderstorms from developing. This can lead to great instability as the lower atmosphere heats up throughout the day. When the storms break through the cap the atmosphere will contain an enormous amount of latent energy to power them. Finally there is wind shear, a change in wind speed and direction with altitude. This strengthens the storms by separating the updraft from the downdraft so they don't interfere with each other and effectively increases the vertical pressure gradient, strengthening the updraft even more. It also give the storms the rotation they need to produce tornadoes. When all these ingredients come together, conditions are ripe for an outbreak with strong tornadoes. Such a setup, however, is rare outside the U.S.
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The U.S. averages between 1,200 and 1,300 tornadoes per year.
The area with the highest tornado frequency in the U.S. is Tornado Alley. A region stretching across the Great Plains from Texas to South Dakota and Iowa. Another tornado hot …spot is in Florida.
70% U.S tornadoes occur in the Great Plains.
about 1,200 tornadoes each year
Because the cold, dry air from Canada meets warm, moist air from the tropics, producing very strong thunderstorms. On top of that, the upper atmosphere hasn't fully warmed up …yet. This, combined with a warming lower atmosphere, is conducive to thunderstorms as well. Finally, strong upper level winds create wind shear the gives storms the rotation they need to produce tornadoes.
The region is prone to collisions of air masses with a very large difference in temperature and/or moisture content. Such collisions produce strong thunderstorms. When wind sp…eed and direction changes with altitude ( a condition called wind shear) can can cause the storms to intensify even further and sometimes start to rotate. Such powerful rotating storms, called supercells, are what produce the majority of tornadoes.
In the Tornado Alley, which consists of the Great Plains, or the states of Texas, Oklahoma, Arkansas, Kansas, Nebraska, North and South Dakota. Tornadoes can and will occur in… other states/areas of this country and others around the globe.
The U.S. gets more tornadoes than any other country.
The Midwest sees a high frequency of tornadoes because of its ideal climatic setup. In the spring storm systems cause warm, moist air from the Gulf of Mexico to collide wi…th cool air from Canada and dry air from the Rockies, resulting in the formation of strong thunderstorms. About a mile off the ground a layer of stable air holds thunderstorm activity back, allowing instability to build underneath it. As a result when the storm break through the cap the instability will be enormous, leading to explosively powerful thunderstorms. At the same time wind speed and direction varies with altitude, which sets these storms rotating and also strengthens the updraft. This rotation combined with strong thunderstorm updrafts can then produce tornadoes.
Official record shows 1,263 tornadoes in the United States in 2005.
Generally, the highest number of tornadoes in the U.S. occur on the Great Plains, so much so that the region is sometimes called Tornado Alley. The region experiences as m…any as 800 tornadoes per year.