The given statement is true. WND in the categorical outlook in the Aviation Area Forecast means that the wind during that period is forecast to be sustained surface wind speed of 20 knots or greater.
Surface wind is the wind blowing near the Earth's surface. It is measured by an anemometer (speed) or wind vane (wind direction) at a standard height of 10 m above ground. As a result of the slowing down of the air as it moves over the ground, wind speeds are less than would be expected from the pressure gradient on the weather map and the direction is changed so that the wind blows across the isobars into a center of low pressure and out of a center of high pressure.
Learn more surface wind at: https://brainly.com/question/13666352
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