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Western Great Plains
It varies, but the U.S. averages about 1,200 tornadoes each year.
It depends on where you live. Tornadoes happen fairly often in the US as a whole, mostly during the spring or fall. However, they typically affect a very limited area. Even though the US is the most tornado-prone area in the world (for example, Europe is slightly larger than the US, but the US has four times as many tornadoes), there are almost no intense (>3 on the Fujita scale) tornadoes west of the Rocky Mountains.
No US State is completely free of tornadoes but the core of Tornado Alley is most often considered to be the Texas Panhandle, Oklahoma, Kansas, Nebraska, Eastern South Dakota and Eastern Colorado.
Tornado Alley
It occurs most frequently in "Hail Alley", which runs from Nebraska to Colorado and up to Wyoming. Frequent thunderstorms combined with the air of orographic winds from the Rockies allows strong updrafts capable of supporting hail. Cheyenne, Wyoming is considered the hail capital of North America, with 9 or 10 days of hail annually on average. Elsewhere, hail can and has occurred in all 50 states, but is least common on the coast and in some of the colder regions, particularly Alaska.
The place with the most tornado sirens would have to be tornado alley
The Central Plains of the United states are often called Tornado Alley because more tornadoes occur there than anywhere else in the world.
The first recorded tornado in the US was in Rehoboth, Massachusetts in August of 1671.
Yes. Tornado Alley is in the south of the U.S.A.
somewhere cold
No part of any country is a tornado. A tornado is a weather event, not a place. However all parts of the US can get tornadoes except, perhaps, for northern Alaska.