The Enhanced Fujita Scale or EF Scale, which became operational on February 1, 2007, is used to assign a tornado a 'rating' based on estimated wind speeds and related damage.

The Fujita Scale Weather.gov > Atlanta/Peachtree City, GA > The Fujita Scale Current Hazards Current Conditions Radar

The Fujita scale was developed in 1971 by T. Theodore Fujita, Ph.D., to rate tornadoes and estimate associated wind speed based on the damage they cause. The EF scale refines and improves the …

Rivers and Lakes Climate and Past Weather Local Programs Fujita Damage Intensity Scale F0 - F1 Weak Tornado F2 - F3 Strong Tornado F4 - F5 Violent Tornado

Enhanced Fujita Scale Weather.gov > Tallahassee, FL > Enhanced Fujita Scale Current Hazards Current Conditions Radar

The EF Scale was revised from the original Fujita Scale to reflect better examinations of tornado damage surveys so as to align wind speeds more closely with associated storm damage.

** Important Note about the Enhanced F-Scale Winds: The Enhanced F-Scale still is a set of wind estimates (not measurements) based on the damage. It uses three-second gusts estimated at the …

NWS Little Rock, AR - Enhanced Fujita Scale Weather.gov > Little Rock, AR > NWS Little Rock, AR - Enhanced Fujita Scale Current Hazards Current Conditions Radar

The Fujita Tornado Scale, usually referred to as the F-Scale, classifies tornadoes based on the resulting damage. This scale was developed by Dr. T. Theodore Fujita (University of Chicago) in 1971.

Climate and Past Weather Local Programs Fujita Tornado Damage Scale Developed in 1971 by T. Theodore Fujita of the University of Chicago