The most powerful tornado is an f-5 tornado which can reach now over 200mph on the enhanced fujita scale and 261-318 on the regular fujita scale
EF5
The most powerful category of tornado is F5 on the Fujita scale or EF5 on the Enhanced Fujita Scale.
In terms of energy output, a volcano is more powerful.
A tornado.
The most powerful August tornado on record was the Plainfield, Illinois tornado of August 28, 1990. It is the only F5 tornado on record to have struck in August. The tornado killed 29 people and injured 350. Over 300 homes were destroyed and 800 damaged.
A F6 tornado does not exist on the Enhanced Fujita scale, which ranges from F0 to F5. The most powerful tornado category, an F5 tornado, has wind speeds exceeding 200 mph and can cause catastrophic damage.
An F5 Tornado is the most powerful category of tornado possible. This tornado pulls well-built homes off their foundations and into the air before shredding them and wiping the foundation clean.
There is no way of knowing for certain what the most powerful tornado was. Once a tornado reaches F5 strength it is difficult to tell whether or not it was stronger than any other F5. The tornado with the strongest recorded winds, the OKC area tornado of May 3, 1999 killed 36. However, other F5 tornadoes that did not have their winds measured may have been stronger.
Both
A supercell tornado is a tornado that forms from the mesocyclone of a supercell. A supercell is the most powerful type of thunderstorm on earth. These storms are characterized by tilted convection and a powerful, rotating updraft called a mesocyclone. Most tornadoes and nearly all strong tornadoes come from supercells.
Tornadoes produce extremely fast winds can can badly damage or destroy man made structures. Depending on the tornado, the strongest winds occur either at the outer edge of the core or within smaller vortices that develop inside the tornado.
A supercell tornado is a tornado that forms from the mesocyclone of a supercell. A supercell is the most powerful type of thunderstorm on earth. These storms are characterized by tilted convection and a powerful, rotating updraft called a mesocyclone. Most tornadoes and nearly all strong tornadoes come from supercells.