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Figure 6.18. Tornado climatology information (U. S.). Annual tornado climatology (mean
number of days/year with one or more tornadoes within 25 miles of a point; purple area
represents values
0.2 and the interval between successive colors is 0.2) in the U. S. for
(top) 1960-1979, (middle) 1980-1999, (bottom) 1990-2009 (courtesy of NOAA).
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