A sudden local fluctuation in velocity of the wind.
Given that the wind in the surface boundary level varies markedly about the mean wind (q.v.), it is often necessary to report the accompanying instantaneous maximum (or gust speed) in a defined period. For METAR reports, then the period over which this peak wind is reported is between 2 and 10 minutes (depending upon the country). For SYNOP reports, the period is either the last hour (most likely in NW Europe), or the period covered by the past weather group in the report - reference to the accompanying amplifying groups will usually sort this out.
a brief increase in wind velocity, as contrasted to a squall, which may last longer
a rapid and irregular fluctuation of varying intensity in the upward and downward movement of air currents
A short-term peak of wind. As weather stations sample the data at frequent intervals, and the anemometer must have some inertia, there is never any guarantee that peak gust speeds are measured accurately. However, this lack of accuracy (while the computer is working) is not important. On the other hand, if the computer is not working (night-time), there is a good chance that peak gust strength is missed by the data logger
A rapid increase in the strength of the wind relative to the mean strength obtaining at the time. It is much short-lived than a squall and is also different in nature.
A rapid fluctuation in wind speed where the peak wind is at least 10 knots (12 miles per hour) higher than the lowest wind.
A brief, sudden increase in wind speed. The speed is at least 10 mph greater than the average wind.
A rapid fluctuation of wind speed with variations of 10 knots or more between peaks and lulls.
A sudden significant increase in or rapid fluctuations of wind speed. Peak wind must reach at least 16 knots (18 miles per hour) and the variation between peaks and lulls is at least 10 knots (11.5 miles per hour). The duration is usually less twenty seconds.
A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.
A sudden, brief increase in wind speed, generally lasting less than 20 seconds. Back to the top
A brief sudden increase in wind speed. Generally the duration is less than 20 seconds and the fluctuation greater than 10 mph.
Sudden brief increase of the wind speed over its mean value.
A sudden, rapid and brief increase in wind speed. In Canada, gusts are reported when the highest peak speed is at least 5 knots higher than the average wind and the highest peak speed is at least 15 knots.
A brief, sudden increase in wind speed, generally of a duration less than 20 seconds with a fluctuation greater than 10 mph (9 knots).
Rapid fluctuations in wind speed with a variation of 10 knots or more between peaks and lulls.
A sudden, brief, increase in the speed of the wind. It is often followed by a lull or slackening in the wind speed.
A sudden increase of wind speed of short duration, usually a few seconds.