That is debatable. Tornadoes are the most violent storms on earth, but their impacts are limited to to their small size when compared to other types of storm. Hurricanes, overall can cause a greater magnitude of death and destruction simply for the fact that they cover a much larger area.
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.
A tornado comes from a type of storm called a rotating thunderstorm, but is not a storm, itself.
A tornado does not "mix" with other storms. A tornado is part of a larger parent storm, though.
The worst tornado to strike the northeastern U.S. was the Worcester, Massachusetts tornado of June 9, 1953. This storm devastated Worcester and nearby communities, killing 94 people and costing $440 million (in 2011 dollars), making it the 20th deadliest and 14th costliest tornado in U.S. History. While this tornado is documented as an F4 it likely reached F5 intensity.
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.
When a storm spawns a tornado it produce a tornado.
Tornado.
The worst tornado was the Daulatpur-Salturia tornado in Bangladesh, it killed more than 1300 people but its intensity is unknown.
storm chasers chase the tornado
The worst dust storm that ever occurred happened in 1989.
There is nothing you can do to storm a tornado.