Wind gust World Meteorological Organization. Any significant variation at this mean wind during the ten minutes preceding the observation are noted as gusts in messages such as METAR. It is generally reported in METAR when the peak wind speed reaches at least 16 knots and the variation in wind speed between the peaks and average wind is at least 9 to 10 knots. In marine meteorology, the top speed of a burst is expressed in meters per second (m/s) or in knots, while the Beaufort scale is used for reporting the mean speed. When the maximum speed exceeds the average speed by
Wind profile power law of wind speed can provide different power densities for the same average wind speed. Wind profile power law The wind profile power law is a relationship between the wind speeds at one height, and those at another. The wind profile power law relationship is : where formula_2 is the wind speed (in metres per second) at height formula_3 (in metres), and formula_4 is the known wind speed at a reference height formula_5. The exponent (formula_6) is an empirically derived coefficient that varies dependent upon the stability of the atmosphere. For neutral stability conditions, formula_6 is approximately 1/7, or 0.143. In