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A Web site developed at the University of Michigan shows where tornados hit the United States each day.

At http://www.tornadopaths.org, visitors can zoom in to see a city, or zoom out to see the entire country.

It's a mashup of data from the National Oceanic and Atmospheric
Administration and Google Maps and Google Earth. Perry Samson, a
professor in the Department of Atmospheric, Oceanic and Space
Sciences, is the developer. Samson is an atmospheric scientist who
studies air pollution and educational technology but whose hobby is
studying extreme weather phenomena including tornadoes. He recently
returned from a summer storm-chasing trip with a team of
undergraduate students.

Complete story in Newswise:
http://www.newswise.com/articles/view/541791/?sc=dwtp

or Visit http://www.tornadopaths.org