Gusts of wind
A gust is, in a given site, a brutal and momentary reinforcement of the wind, which results in a short and sudden rise the instantaneous speed of the wind compared to value then acquired by its mean velocity. Each gust has some Amplitude which makes pass the wind of a minimum instantaneous speed to a maximum instantaneous speed called top speed of the gust; it can happen that this top speed is higher of 50 % or more at the speed of the moderate wind. Largest the top speeds recorded in a given time interval provides the maximum speed of the wind during this interval.
In marine Meteorology, the top speed of a gust is expressed in meters a second (abr. : m.s) or in nodes, while the Beaufort scale is reserved at the mean velocities. When maximum speed exceeds from 10 to 15 nodes the mean velocity, the bulletins of marine Météorologie French employ the term of gusts; they use the expressions strong gusts when this difference ranges between 15 and 25 nodes and violent gusts when it exceeds 25 nodes. In aeronautical Meteorology, one speaks about gusts when the maximum speed of the wind exceeds at least 10 nodes its mean velocity.
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