Instruments rarely measure a tornado’s peak wind speed directly. Surveyors use the damage to assign an EF rating. EF Scale makes the Enhanced Fujita Scale easier to use. You can use it to examine previous tornadoes, to record damage outdoors, or to know more about the scale.
Select the damage indicator for the structure or vegetation. Compare the damage that you see with the degrees of damage and the example photos. Then examine the expected wind speed range and the EF rating. To adjust for construction quality, use the estimator. The estimate stays between the EF Scale limits. All of the EF Scale data is available without a connection.
EF Scale does not replace a damage survey. For an accurate damage survey, approved personnel must examine all of the damage in the area. The National Weather Service and its delegates do the damage surveys that give tornadoes their EF ratings.
