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The EF or Enhanced Fujita scale is primarily based on damage.

Scientists analyze the damage done by a tornado to estimated what how strong its winds were at peak intensity. The tornado is given the EF rating whose wind range corresponds with the peak wind estimates of the tornado.

Because of the uncertainty of these wind estimates direct win measurements are not used even when they are obtained.

Here are the wind estimate ranges of the Enhanced Fujita scale levels.

EF0: 65-85 mph

EF1: 86-110 mph

EF2: 111-135 mph

EF3: 136-165 mph

EF4: 166-200 mph

EF5: over 200 mph

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