Murfreesboro, TN EF-4 tornado, April 10, 2009. Photo credit Titus Bartos, TitusBartos.com/PhotoBlog/ Tornadoes are violent columns of rotating air that are produced by severe thunderstorms. Weak tornadoes produce wind of 65-85 mph, while the strongest (such as the Joplin, MO tornado of May 2011), produce wind of over 200 mph and can be 1/2 to…
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