They can also be called twisters.
This condition is called wind shear. It is indeed a crucial factor in producing tornadoes.
Tornadoes can probably occur in any country as any place that can get thunderstorms can get tornadoes.
Tornadoes are sometimes called twisters.
Tornadoes in the United States are simply called tornadoes. In informal contexts they are sometimes called twisters.
Tornadoes in the U.S. are called tornadoes.
Tornadoes are sometimes called twisters, but tornado is the preferred scientific term.
Tornadoes have been happening from the beginning from our planet's birth. Since then we have not been able to record the amount because there were no intelligent human life, no recorded written language, and there were tornadoes in areas with no inhabitants. We do not have the exact number of tornadoes that have occurred on this planet. Yet we do have the number of tornadoes average per year in different countries.
There were 934 tornadoes in the U.S. in 2002. Worldwide it is harder to determine as many countries do not keep records of tornadoes
No. Tornadoes can happen almost anywhere. However, the are more common in certain countries such as the United States and Bangladesh
There were 1265 tornadoes in the U.S. in 2005. Statistics for other countries are unavailable.
A twister is a tornado. A hurricane is bigger and entirely different type of storm.