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Tornadoes are categorized on the basis of their destruction by the Fujita scale. The scale relates tornado destruction to wind speed, though the relationship has not been scientifically proven. For instance an F1 tornado with winds of 73-112 mph causes moderate damage.
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www.uwsp.edu/geo/faculty/ritter/geog101/textbook/weathe...
www.uwsp.edu/geo/faculty/ritter/geog101/textbook/weather_systems/tornados.html
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I found the following information, The Fujita Scale The Fujita Scale is a well known scale that uses damage caused by a tornado and relates the damage to the fastest 1/4-mile wind at the height of a damaged structure. Fujita's scale was des...
http://wiki.answers.com/Q/How_is_a_tornadoes_severity_c...
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They can be categorized as "weak", "strong", and "violent"; with weak tornadoes often having a thin, rope-like appearance, as exhibited by this tornado near Dawn, Texas. About 7 in 10 tornadoes are weak, with rotating wind speeds no greater than about 110 MPH. (looking west from about 1 mile.)
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ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/svr/torn/home.rxm...
ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/svr/torn/home.rxml
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Tornadoes;; tornado n : A violently rotating column of air associated with a thunderstorm that is in contact with the ground. Tornadoes are categorized as weak, strong or violent with winds of up to, or more than 300 mph.
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www.stormstock.com/tornado_footage.html
www.stormstock.com/tornado_footage.html
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Summary of tornado climatology ... Overall, most tornadoes (around 77%) in the U.S. are considered weak (EF0 or EF1) and about 95% of all U.S. tornadoes are below EF3 intensity. The remaining small percentage of tornadoes are categorized as violent (EF3 and above).
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www.ncdc.noaa.gov/oa/climate/severeweather/tornadoes.ht...
www.ncdc.noaa.gov/oa/climate/severeweather/tornadoes.html
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Tornadoes Kick Storm Chasing - Home to Storm Chaser Tony Laubach ... 2009 Tornadoes ... Lifetime Tornadoes...
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www.tornadoeskick.com/
www.tornadoeskick.com/
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Tornado wind speeds are estimated after the fact based on the damage they produce. ... Tornado wind speeds are estimated after the fact based on the damage they produce. Tornadoes are categorized on a scale of 0 (weakest) to 5 (strongest) according to the Enhanced Fujita Scale.
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www.lycos.com/info/tornado--tornadoes.html
www.lycos.com/info/tornado--tornadoes.html
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The cold follows a weather system that spawned two tornadoes that damaged homes, schools and churches in Walker and St. ... The tornadoes - categorized as EF-1, meaning with wind gusts of more than 86 mph, were part of a system that entered the state overnight and spawned numerous tornado and thunderstorm warnings.
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www.al.com/news/birminghamnews/metro.ssf?/base/news/122...
www.al.com/news/birminghamnews/metro.ssf?/base/news/1228986954281170.xml&coll=2
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Never remain in your car. Tornadoes are much too fast to outrun and are strong enough to lift a car up and throw it. ... Satellite Tornadoes; Small tornadoes that are born off of major tornadoes and can go off in their own destructive path.
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www.safety.com/articles/tornado-terms-to-know.html
www.safety.com/articles/tornado-terms-to-know.html
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