, °F

Personalized Forecasts

Featured Forecast

My Favorite Forecasts

    My Recent Locations

    Infographic: When A Tornado Destroys Everything

    May 19, 2013; 1:18 AM ET
    Share |

    The Enhanced Fujita Scale is used to assign tornadoes a rating based on estimated wind speeds and damage.

    The EF Scale became operational on Feb. 1, 2007. It was revised from the original Fujita Scale, developed in 1971 by Tetsuya Fujita, to better reflect wind speed with damage observed in tornado surveys.

    Deadly Severe Weather Facts & Safety Tips:

    Report a Typo


    Comments left here should adhere to the AccuWeather.com Community Guidelines. Profanity, personal attacks, and spam will not be tolerated.

    More Weather News

    Daily U.S. Extremes

    past 24 hours

      Extreme Location
    High N/A
    Low N/A
    Precip N/A

    Weather Whys®

    This Day In Weather History

    Chicago, IL (1997)
    58 mph winds cause damage. 15 foot waves crash onto Lake Shore Drive.

    Honduras (1998)
    Hurricane Mitch attains category 5 on Saffir-Simpson scale. 20-40 foot waves smash Honduras. Over a four day period, over 10,000 lose their lives in Central America.

    New York City, NY (1859)
    Earliest substantial snow -- 4 inches fell.

    Rough Weather