Weather vanes measure wind direction.
  • A wind vane is a tool for measuring wind direction. Knowing the direction of the wind helps meteorologists determine in which direction a storm or weather system will travel.

    From: http://teacher.scholastic.com/activities/wwatch/gather_data/windvane.htm

Wind Vanes

  • A WIND VANE is an instrument that determines the direction from which the wind is blowing. 

    From: weatherwizkids.com