Fujita-Pearson Tornado Scale          

______________________________________________________________________

      Tornado Class      Wind Speed         Path Length     Path Width     Severity of Destruction

                       (miles per hour)      (in miles)      

_______________________________________________________________________________________

          Class 0           < 73            <   1.0        < or =  17 yards          -   

          Class 1        73 - 112.0         1.0 -  3.1     18 -  55 yards          Minimal

          Class 2        113 - 157.2        3.2  -  9.9    56 - 175 yards            Mild

          Class 3        158 - 206          10.0 - 31.9    0.34 - 0.9 miles        Moderate

          Class 4        207 - 260          32.0 - 99.0   1.0 - 3.1 miles          Severe

          Class 5        > 260              100.0-999.0    3.2 - 9.9 miles          Total

Source: National Climatic Data Center