How a tornado’s strength is measured

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The Enhanced Fujita scale, which measures the strength of tornados, ranges from the weakest at EF0 to the strongest at EF5. Here is how the scale works.

Measurement		Damage possible
	EF0 Wind gusts: 65 to 85 mph	Light damage: Damage likely to include chimneys, branches broken off trees and shallow-rooted trees being knocked over.
	EF1 86 to 109 mph	Moderate damage: Can peel off roofs, push mobile homes off foundations and blow cars off roads.
	EF2 110 to 137 mph	Considerable damage: Can tear roofs off frame homes, demolish mobile homes, overturn boxcars and snap or uproot large trees.
	EF3 138 to 167 mph	Severe damage: Can tear roofs and walls off well-constructed homes, uproot trees and lift cars off the ground and throw them.
	EF4 168 to 199 mph	Devastating damage: Can level well-constructed homes and blow away those with weak foundations. Cars can be thrown.
	EF5 200 to 234 mph	Incredible damage: Can level strong-framed houses. Cars can be thrown the length of a football field. Trees can be stripped of bark.

Source: NOAA’s National Weather Service Storm Prediction Center

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