8 - WIND 8.1 Introduction . This chapter describes observing and determining procedures for wind data in surface weather reports. 8.2 Definitions . 8.2.1 Direction of Wind .
Wind direction is defined as the direction from which the wind is blowing.
8.2.2 Gust . Rapid fluctuations in wind speed with a variation of 10 knots or more between peaks and lulls. 8.2.3 Light Wind . The wind is considered to be light when the speed is 10 knots or less. 8.2.4 Magnetic Variation .