Tornadoes require thunderstorms to develop. Tornadoes form in the updraft portion of a thunderstorm, which, due to the way wind shear works, is usually in the rear part of the storm.
A tornado warned storm is a thunderstorm for which a tornado warning has been issued, meaning that the storm is producing rotation that can spawn a tornado.
It varies. Sometimes it will intensify again and produce another tornado. Sometimes it will dissipate. Sometimes it will continue for a while as an ordinary storm for a while before dissipating.
A tornado comes from a type of storm called a rotating thunderstorm, but is not a storm, itself.
It can get quite, but not always. On a number of occasions people have reported an eerie silence before a tornado strikes. However, in other cases, the storm keeps on raging even as the tornado strikes.
A tornado does not "mix" with other storms. A tornado is part of a larger parent storm, though.
The calm before a tornado is due to the changing wind patterns and pressure within a tornado-producing storm. As the storm intensifies, air begins to rise rapidly, creating a calm and still area near the center of the storm before the tornado forms. This calm period is often short-lived and is followed by the destructive tornado itself.
A storm can't turn into a tornado, it a thunderstorm can produce one.
A tornado warned storm is a thunderstorm for which a tornado warning has been issued, indicating that it is capable of producing a tornado. A tornado threat is a general term that refers to the danger tornadoes may pose to an area during a particular storm.
Before a storm develops into a tornado, it typically forms a rotating wall cloud. This wall cloud can often be seen beneath a thunderstorm and is a key indicator of a possible tornado forming. It is important to monitor the situation closely and take appropriate precautions if a wall cloud is observed.
Tornado.
When a storm spawns a tornado it produce a tornado.
Storm chasers have helped to identify features within a storm that are signs of a possible or imminent tornado including the "hook echo" signature sometimes seen on a radar image, and the rear-flank downdraft which often occurs just a few minutes before a tornado forms. Storm chasers can also relay information about a tornado to warning centers and broadcasters who can then warn people in the tornado's path.