How to measure Tornado?
The size of a tornado is not necessarily an indication of its intensity. Large tornadoes can be weak, and small tornadoes can be violent. Tornadoes are classified according to wind speed (m/s or km/h) and according to damages caused by them.
There are three wind speed scales
1. Beaufort wind speed scale – created 200 years ago in 1805. It measures wind speed to observed conditions at sea or on land like on the picture.
2. TORRO or T-Scale was created in Europe. T-scale is Beaufort wind speed scale modified for tornado wind speed. It measures Tornado intensity between T0-weak and T11-violent.
3. The Fujita Scale or F-scale was created in 1970s as the official classification system for tornadoes used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure. It is used for example in U.S. for strong tornadoes.