WIND
Direction
Wind direction is determined using wind vane.
How It Works
- As the wind blows the arrow swings.
- The arrow points in the opposite direction of the wind flow.
- The direction is read from the cardinal compass points.
- The arrow will point in the direction from which the wind is blowing.
- For instance if it points S the wind is blowing from S towards N.
Wind Sock
– Used to indicate the general direction of wind flow.
– Not kept in a weather station because it doesn’t give the accurate direction of wind flow.
– Seen near airstrips for the benefit of pilots.
How it Works
- When wind blows the bas stretches out in the direction that the wind is blowing.
Wind speed/Velocity
– Measured using anemometer.
How It Works
- When wind bows hemispherical cups rotate.
- The number of rotations is obtained from the metre on the lower part of the anemometer.
• The units for measuring wind are called knots.