Which is the name of the scale used to measure tornado intensity?

As the studies of tornados, their damage, and their intensity became more of interest. a scale to measure intensity was developed and is now accepted as the standard. The original scale as derived by Fujita was a theoretical 13-level scale (F0–F12) designed to smoothly connect the Beaufort scale and the Mach number scale. F1 corresponds to the twelfth level of the Beaufort scale, and F12 corresponds to Mach number 1.0. F0 was placed at a position specifying no damage (approximately the eighth level of the Beaufort scale), in analogy to how Beaufort's zeroth level specifies little to no wind. In 2007, the Fujita scale was decommissioned, and the Enhanced Fujita Scale was introduced in the United States. It has gained acceptance in North America.

The observed damage after the tornado is how the intensity of F Scale is determined. For an F 5 tornado, observed damage would be: "Incredible damage.

Cars are mangled and thrown hundreds, possibly thousands of meters away. Frame homes, brick homes, and small businesses are swept away, trees debarked, corn stalks flattened or ripped out of the ground, skyscrapers sustain major structural damage, grass ripped out of the ground. Wood and any small solid material become dangerous projectiles." Measuring human fatalities is also considered. So far, no tornado has been scaled at higher than an F 5 event. Wind speeds are estimated at 419–512 km/hr and only about 0.1% of all tornados are scaled at F 5.