Yes. On rare occasions tornadoes have been known to merge with one another.
When two tornadoes merge, they can create a larger and more destructive tornado. The combined forces of the two tornadoes can result in increased wind speeds and damage along a wider path. This phenomenon is known as a tornado outbreak.
No, it is not possible to stop a tornado with another tornado. Tornadoes are formed by specific weather conditions in the atmosphere, and introducing another tornado would not have any effect on the existing tornado.
Thunderstorms are not called tornadoes, however, some thunderstorms will produce tornadoes. The word tornado likely comes from the Spanish word "tronada" meaning "thunderstorm" being combined with another Spanish word "tornar" meaning "to turn" in reference to the rotation of a tornado.
Another name for a tornado is a twister.
Tornado
A tornado and a hurricane cannot "combine" as they operate on different scales. It is fairly common for tornadoes to produce tornadoes.
Yes. In some cases a large, strong tornado will produce what is called a satellite tornado, which circles the main one.
No. Twister is just another word for a tornado.
Yes, in some instances one tornado may spawn a smaller satellite tornado.
Whirlwind?
Tornado
A hurricane and a tornado cannot combine into a single storm as they operate on completely different scale. It is actually fairly common for hurricanes to produce tornadoes.