Hail Diameter Size and Wind Descriptors

							Hail Diameter Size and Wind Descriptors
    Hail Diameter Size                  Description
            1/4"                           Pea Size

            1/2"                         Marble Size

            3/4"                         Penny Size

            7/8"                         Nickel Size

     1" (Severe Criteria)                Quarter Size

           1 1/4"                      Half Dollar Size

           1 1/2"                Walnut/Ping Pong Ball Size

           1 3/4"                       Golf Ball Size

             2"                         Hen Egg Size

           2 1/2"                      Tennis Ball Size

           2 3/4"                       Baseball Size

             3"                          Teacup Size

             4"                        Grapefruit Size

           4 1/2"                        Softball Size


Wind Speed Estimation                     Description
    less than 1 mph                Calm; smoke rises vertically
                             Direction of wind shown by smoke drift,
       1 - 3 mph
                                      but not by wind vanes
                                 Wind felt on face; leaves rustle;
       4 - 7 mph
                                 ordinary vane moved by wind
                            Leaves and small twigs in constant motion;
      8 - 12 mph
                                     wind extends light flag
                                   Raises dust and loose paper;
      13 - 18 mph
                                    small branches are moved
      19 - 24 mph               Small trees in leaf begin to sway;
                            crested wavelets form on inland waters
                                 Large branches in motion;
     25 - 31 mph
                              whistling heard in telephone wires
                                    Whole trees in motion;
     32 - 38 mph
                          inconvenience felt walking against the wind
                                   Breaks twigs off trees;
     39 - 46 mph
                               wind generally impedes progress
                                   Slight structural damage
     47 - 54 mph
                                             occurs
Severe begins at 58 mph
                            Damage to chimneys and TV antennas;
     55 - 63 mph
                              pushes over shallow rooted trees
                                     Rarely experienced;
     64 - 74 mph
                             structural damage becomes possible
                                 Very rarely experienced; see
    above 75 mph
                                  Fujita scale descriptions