The Enhanced Fujita Scale provides an estimated range of a tornado's wind speeds, based on the tornado's damage.

The Enhanced Fujita Scale: How Tornadoes are Rated

The Enhanced Fujita Scale provides an estimated range of a tornado's wind speeds, based on the tornado's damage.

EF SCALE – The enhanced Fujita Scale has been used by the National Weather Service since February 2007 to measure the damage caused by a tornado. Find out how the scale was created and what it measures.

EF SCALE – The enhanced Fujita Scale has been used by the National Weather Service since February 2007 to measure the damage caused by a tornado. Find out how the scale was created and what it measures.

Tornado Rating: Enhanced Fujita Scale

Tornado Rating: Enhanced Fujita Scale

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NASA~~Tornado Tracks~~June 14th, 2012 by Michon Scott. This map breaks down tornadoes by strength based on the Fujita scale. Stronger tornadoes appear as brighter lines. (An enhanced Fujita scale was implemented in 2007, but these tornado tracks were classified according to the earlier version.)

NASA~~Tornado Tracks~~June 14th, 2012 by Michon Scott. This map breaks down tornadoes by strength based on the Fujita scale. Stronger tornadoes appear as brighter lines. (An enhanced Fujita scale was implemented in 2007, but these tornado tracks were classified according to the earlier version.)

The Enhanced Fujita scale (EF-Scale) rates the strength of tornadoes in the United States and Canada based on the damage they cause. http://en.wikipedia.org/wiki/Enhanced_Fujita_scale

The Enhanced Fujita scale (EF-Scale) rates the strength of tornadoes in the United States and Canada based on the damage they cause. http://en.wikipedia.org/wiki/Enhanced_Fujita_scale

The National Weather Service adjusted the rating system used to grade tornadoes in 2007. Formerly the "Fujita Scale," the service now uses the "Enhanced Fujita Scale," which is determined based on wind speed and surveyed damage. While most tornadoes strike in "tornado alley," some of the more violent tornadoes since 2007 have been reported in Alabama.

Tornado devastates Moore, Oklahoma

The National Weather Service adjusted the rating system used to grade tornadoes in 2007. Formerly the "Fujita Scale," the service now uses the "Enhanced Fujita Scale," which is determined based on wind speed and surveyed damage. While most tornadoes strike in "tornado alley," some of the more violent tornadoes since 2007 have been reported in Alabama.

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