That is largely a matter of opinion, and it can also depend on the tornado. Many storm chasers have said that some tornadoes are beautiful in appearance. By contrast, one woman described the appearance of the tornado that hit Joplin, Missouri in 2011 as evil. What tornadoes can do is certainly far from beautiful.
Ugly is in the eye of the beholder. Tornadoes do ugly things in destroying homes and hurting and killing people. On the other hand, in terms of appearance, some people find tornadoes beautiful.
Tornadoes in the U.S. are called tornadoes.
Tornadoes are sometimes divided into "weak" tornadoes "strong" and "violent" tornadoes. Weak tornadoes are those rated EF0 and EF1. Most tornadoes are weak. Strong tornadoes are those rated EF2 and EF3. Violent tornadoes are those rated EF4 and EF5. They are the rarest of tornadoes, only about 1% of tornadoes are this strong.
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.
Tornadoes don't get named, Hurricanes do, but Tornadoes don't.
Florida frequently has tornadoes, though several states have more tornadoes annually.
No. Tornadoes are dangerous.
Yes, some strong tornadoes create brief satellite tornadoes that circle the main funnel.
Antarctica is the continent that does not have tornadoes. Tornadoes typically form over land, so the cold and uninhabited nature of Antarctica makes it unlikely for tornadoes to occur there.
Tornadoes are often referred to simply as "tornadoes" or "twisters."
There is nothing to be "done" about tornadoes. Tornadoes are a natural weather event.
Landforms do not create tornadoes. Tornadoes are a product of severe thunderstorms.