Measurement
The Wind Sock
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A windsock shows both wind direction and a rough idea of wind speed.
The open end faces into the wind, while the narrow end points downwind. As the wind gets stronger, the windsock lifts and stretches out more horizontally.
Watch how the windsock changes as gusts come and go.
Additional Information
Airports use standardized wind socks so pilots can judge wind direction and rough speed at a glance before takeoff or landing.
A fully horizontal wind sock generally means wind speeds of around 15 knots (about 28 km/h) or more.
The open, tapered shape is specifically designed to catch even a light breeze and swing to point true regardless of gusts.