Weather Science: How common are tornadoes in the United States?

The reason why the United States is called "the hometown of tornadoes" is that it has 1000 to 2,000 tornadoes every year, with an average of 5 tornadoes every day. Searching for the keyword "American tornado" on Baidu website can also find 3.96 million related contents. It is enough to explain the high frequency of tornadoes in the United States. Tornado is the most severe strong convective weather, which exists in the severe thunderstorm weather system with extremely unstable energy and abundant water vapor, and has the characteristics of small range and short life. Tornadoes in the United States are not only numerous, but also strong and destructive. Meteorologists pointed out that this is mainly related to the geographical location, climatic conditions and atmospheric circulation characteristics of the United States.