Is there a rating system for tornadoes?

In fact, there are three such rating systems.

The first and most famous is the Fujita scale developed in the United States 1971. This scale runs from F0 at the weakest to F5 and the strongest and bases its ratings on damage and provides corresponding wind estimates. Most countries use the Fujita scale to rate tornadoes.

Second is the TORRO scale, developed in the UK in 1975. This scale is like the Fujita scale in that it primarily uses damage to rate tornadoes and even uses similar wind estimates. However this scale has twice as many categories, running from T0 to T11 (T0 and T1 correspond to F0 , while T10 and T11 correspond to F5). It is primarily used in the UK and a few other European countries.

Finally there is the Enhanced Fujita scale developed in the United States in 2007. It is a more sophisticated version of the Fujita scale, with better defined damage descriptions and adjusted wind estimates and runs from EF0 to EF5. So far only the United States and Canada use the Enhanced Fujita scale.