TORNADO FORCE SCALE                

           F SCALE            SPEED (MPH)       DAMAGE
        ===========================================================
           
             F0                  40-72           LIGHT DAMAGE
             F1                  73-112          MODERATE DAMAGE
             F2                  113-157         CONSIDERABLE DAMAGE
             F3                  158-206         SEVERE DAMAGE
             F4                  207-260         DEVASTATING DAMAGE
             F5                  261-318         INCREDIBLE DAMAGE
             F6-F12              319+            INCONCEIVABLE DAMAGE