8.12 Wind

8.12.2 Define the measurement of the standard surface wind in aviation meteorological reports and forecasts.

Surface wind is measured at a standard height of 10 metres above ground level.

Wind speed is measured by an anemometer, and wind direction is measured by a wind vane.

The standard height of 10 metres helps reduce the effect of local surface disturbances and allows wind reports from different observing stations to be compared more accurately.

8.12.4 State the units used to describe wind speed.

In New Zealand aviation, wind speed is normally reported in knots.

For example:

• Wind 180 degrees at 15 knots
• Wind 220 degrees at 10 knots, gusting 20 knots

8.12.6 State the units used to describe wind direction with reference to:

Wind direction is described as the direction from which the wind is blowing.

Wind direction is given in degrees around the compass from 000° to 360°, measured clockwise from north.

(a) forecasts and observations issued by MetService;

Forecasts and observations issued by MetService give wind direction in degrees True.

Examples include: