The Fujita-Pearson scale, formally known as the Fujita scale, is the scale used to rate how destructive a tornado is. The lowest rating is a f0, which has little to no damage on human structures and vegetation. The highest ever recorded rating was an f5, which has a large and sometimes deadly impact on human structures, vegetation and humans ourselves. In 2007 the Enhanced fujita scale was introduced in america, which canada also embraced. It accurately measures wind speed with the amount of destruction a tornado inflicts. It was created in 1971 by Tetsuya Fujita and Allen Pearson, which over the years was moderated slightly, until the 2007 update. The Fujita scale goes up to f12, but Fujita himself phrased a f6 as an “inconceivable tornado”.