Wind     Classification   Characteristics
  Speed
  (MPH)

   <1     Calm             Smoke rises vertically

   1-3    Light Air        Smoke drift shows direction ; wind vanes don't

   4-7    Light Breeze     Wind felt on face ;  leaves rustle ; wind vanes move

   8-12   Gentle Breeze    Leaves and small twigs move ; light flags extend

  13-18   Moderate         Dust raised ; loose paper, small branches move

  19-24   Fresh            Small trees in leaf sway ; crested wavelets on inland lakes

  25-31   Strong           Large branches in motion ; wires whistle ; umbrellas used with difficulty

  32-38   Near Gale        Whole tree in motion ; inconvenience felt walking against wind

  39-46   Gale             Twigs break off ; impedes progress

  47-54   Strong Gale      Slight structural damage occurs

  55-63   Storm            Tree limbs broken ; considerable minor damage occurs

  64-72   Violent Storm    Widespread damage

  73-82   Hurricane        Violence and destruction