Weather Research Center

Dvorak Cyclone Classification



        CI Number               Wind Speed (Kts)        Mean SLP (hPa)

        1.0                             25                  ------
        1.5                             25                  ------
        2.0                             30                  1009
        2.5                             35                  1005
        3.0                             45                  1000
        3.5                             55                   994
        4.0                             65                   987
        4.5                             77                   979
        5.0                             90                   970
        5.5                            102                   960
        6.0                            115                   948
        6.5                            127                   935
        7.0                            140                   921
        7.5                            155                   906
        8.0                            170                   890