A rotating, violent column of air formed through cumulonimbus clouds.
It depends on what area you define as Tornado Alley, as there are no officialli defined boundaries, but it appears that the region averages between 450 and 500 tornadoes per year.
A tornado is defined as a "violently rotating column of air." However, a violent tornado is generally considered one rated F4 or F5 an which case, then less than 1 percent of tornadoes are rated as violent.
A tornado is a violently rotating an often destructive column of air extending from the base of a thunderstorm to the ground. They are often made visible by a condensation funnel and a cloud of dust and/or debris. A supercell is a type of very powerful, rotating thunderstorm typically defined by a rotating updraft called a mesocyclone. They are the strongest thunderstorms on earth. The majority of tornadoes are produced by the mesocyclone of a supercell.
The SPC did not include a hatched area for tornadoes for March 25, which would indicate a 10% or greater chance of strong tornadoes within 25 miles of a given point. In fact, only a 5% risk area was defined for tornadoes overall. In most cases, this would suggest that strong tornadoes are unlikely, but it does not rule out the possibility. That at least one strong tornado (EF2 or EF3 by the looks of the damage) occurred shows that there was indeed such a risk.
Tornadoes in the U.S. are called tornadoes.
The total official counts of tornadoes in 2014 have not been finalized. Final totals will be released in March or April 2015. Some preliminary counts are available, but are probably somewhat less than what the final count will be. These preliminary counts show 39 tornadoes in the Southwest in 2014, for these purposes defined as California, Nevada, Utah, Arizona, New Mexico, and Colorado.
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.
No. Tornadoes are dangerous.
Florida frequently has tornadoes, though several states have more tornadoes annually.
It depends. A tornado is defined as a "violently rotating column of air" and most people would consider any tornado a violent event. However, in discussing tornado strength, a violent tornado is one of EF4 or EF5 intensity. Less than 1% of tornadoes recieve such ratings.