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Title: TORNADO OCCURRENCE IN THE UNITED STATES
Caption: Average occurrence of tornadoes per 26,000 km2 (10,000 mi.2) in the United States and southernmost Canada from 1950-2000. (After Christopherson, R. W. 2006. Geosystems; An introduction to physical geography, 6th ed. Upper Saddle River, NJ: Pearson Prentice Hall. Data from National Severe Storm Forecast Center, National Weather Service)
Keywords: atmosphere, tornadoes