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
Apparent wind of the true wind" minus the "velocity of the object". In sailing, "apparent wind" is the speed and direction of wind indicated by a wind instrument (anemometer) on a "moving" craft (on water, land or ice) in undisturbed air. It is composed of the "combined" speeds and directions of the craft and wind observed by a "stationary" wind instrument—the "true wind". A true wind coming from the bow increases the apparent wind induced by the speed of the craft, coming from the stern it decreases apparent wind, and coming from the side the apparent wind angle and speed change according