Introduction to Wind

The wind is the term used to define the horizontal flow of air as it moves from one place to another. The direction of this wind is the direction from which it is blowing and its velocity is given in nautical miles per hour, or knots.

Winds velocity information provided by a control tower at an airfield gives the direction in degrees magnetic to coincide with the magnetic direction of the runway.


The wind is depicted as a straight line coming from the periphery of a circle. The examples above show a wind direction of 090°.

The wind speed is normally given in knots. Other units used are kilometres per hour and metres per second.

The direction is usually given in °T. Exceptions to this are in an ATIS or verbally from the control of the pilot to calculate the wind components if the wind speed is also given in magnetic.

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