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.