Wind gust 10 to 15 knots, the term "gusts" is used while "strong gusts" is used for departure of 15 to 25 knots, and "violent gusts" when it exceeds 25 knots. Wind gust A gust or wind gust is a brief increase in the speed of the wind, usually less than 20 seconds. It is of a more transient character than a squall, which last minutes, and is followed by a lull or slackening in the wind speed. Generally, winds are least gusty over large water surfaces and most gusty over rough land and near high buildings. The wind is measured using
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