What Are The Six Categories Of Tornadoes?

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According to Enhanced Fujita Scale, the tornadoes in the United States and Canada can be rated in six categories: EF0, EF1, EF2, EF3, EF4 and EF5.
Scale Wind speed (mph) Rating classifications
EF0 65–85 Weak
EF1 86–110 Weak
EF2 111–135 Strong and significant
EF3 136–165 Strong, significant and intense
EF4 166–200 Violent, significant and intense
EF5 >200 Violent, significant and intense
Figure 1. The six categories of tornadoes of the Enhanced Fujita Scale
EF5 tornadoes have happened in the Unites States, which are nines in Kansas, Mississippi, Iowa, Alabama, Missouri and Oklahoma. Some tornadoes can look the same but they do not cause the same damages even though the weakest tornadoes may kill. Examples of this fact is the report of tornadoes between 1997 and 2005 which states 3 people were killed by F0 tornadoes and 38 by F1 tornadoes in the United States. F0 tornadoes cause superficially damages to structures and the environment. The conventional building cannot be damage too much if the building is well constructed. This building
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