A tornado can extend upwards from about 5,000 to about 60,000 feet
Normally they turn counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. However, in very rare cases a tornado turns in the opposite direction from normal. These are called anticyclonic tornadoes.
Yes, tornadoes can strike big cities. While less common than in rural areas, tornadoes have been known to hit major cities like Oklahoma City and Dallas. Urban areas may experience less frequent tornadoes due to the presence of buildings and infrastructure, but they are not immune to tornado activity.
Tornadoes can merge together, yes, and vortex physics predict that the combined tornado will be larger than either of the merging tornadoes. However, most tornado mergers involve a large tornado absorbing a small one, so the larger tornado is not affected very much.
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.
Tornadoes are often referred to simply as "tornadoes" or "twisters."
Supercells are normally associated with tornadoes.
If they were little they wouldn't be tornadoes
That depends on what you mean by "mini tornado" as it has no real definition. If you mean small, weak tornadoes, then yes. Even in areas prone to large tornadoes, the smaller ones will still be in the majority. However, weak tornadoes are rarely heavily covered unless they strike in places not not normally associated with tornadoes.
Northeast
Big tornadoes are usually strong, but not always. A large, poorly organized tornado is not likely to be very strong. Some tornadoes even weaken as they expand.
No, normally tornadoes spin clockwise in the southern hemisphere.
Normally in the Spring and early summer. But tornadoes can happen all year long.
It is not uncommon for tornadoes to occur in Mississippi during the summer, but they are more common in the spring.
Most tornadoes are 50 to 100 yards wide.
Tornadoes are more common in the northern half of Alabama than in the southern part, though the whole state is pretty prone to tornadoes.
No, tornadoes typically form over land in association with thunderstorms. Waterspouts, which are tornadoes that form over water, can occur in tropical oceans under specific conditions, but they are generally much weaker than tornadoes that form over land.
Generally, small tornadoes do less damage than large ones, but some small tornadoes have been very destructive.