On average the U.S. gets 1,000 tornadoes each year.
the Midwest which is tornado alley
When it rains.
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Tornadoes are often referred to simply as "tornadoes" or "twisters."
No, hail doesn't fall in tornadoes, but it often falls near them.
Tornadoes are often called twisters.
Yes, tornadoes often change in appearance.
Tornadoes themselves do not produce rain but they are often accompanied by it.
Tornadoes happen all around the world and it depend on your location as to how many tornadoes you will have.
It depends on what you mean by extreme. Tornadoes of EF4 and EF5 tornadoes, however are often referred to as violent tornadoes. These account for about 1% of all tornadoes.