Tornadoes are rated on the Fujita scale or the Enhanced Fujita scale by the weather service of the country they occur in.
For example tornadoes in the United States are rated by the National Weather Service while tornadoes in Canada are rated by Environment Canada.
Tornadoes are typically classified by the National Weather Service (NWS) in the United States. They use the Enhanced Fujita (EF) scale to determine the intensity of a tornado based on damage caused. The scale ranges from EF0 (weakest) to EF5 (strongest).
Tornadoes are rated based on the severity of the damage they inflict. The general indicator of F5 intensity in a tornado is well-constructed houses that have been wiped clean off their foundations.
The Fujita scale actually classifies tornadoes based on the amount of damage they do to buildings and plants. If a small tornado with extremely high winds and a small footprint takes out a farmhouse and a corn field, it's bad. But if a tornado that has winds not as high as that small one but has a footprint a quarter mile across sweeps through a town and shreds it, that's much worse. The former tornado will have a rating lower on the Fujita scale than the latter one will. Note that the damage assessment and the application of a Fujita scale rating will come after the tornado has passed.
Storms are classified as tornadoes when winds are from 40 mph to 72 mph. These tornadoes cause light damage, chimney damage, and broken tree branches.
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The Fujita scale classifies tornadoes based on damage.
The general damage indicator for an F4 tornado is well built houses completely leveled and left as piles of rubble. In the U.S. this has been replace by the EF4 category, which is on a somewhat less arbitrary scale. While the overall damage is essentially the same, more factors are taken into account such as quality of construction. On the new Enhanced Fujita scale an EF4 rating is given to a tornado with estimated peak winds in the range of 166 to 200 mph.
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