<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div style="text-align: start;"><span style="text-align: -webkit-center; -webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Is a sudden, brief increase in speed of the wind. </span></div><div style="text-align: start;"><span style="text-align: -webkit-center; -webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div style="text-align: start;"><span style="text-align: -webkit-center; -webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">A</span><span style="background-color: rgba(255, 255, 255, 0); text-align: -webkit-center; -webkit-text-size-adjust: auto;">ccording to U.S. weather observing practice, gusts are reported when the peak wind speed reaches at least 16 knots and the variation in wind speed between the peaks and lulls is at least 9 knots. </span></div><div style="text-align: start;"><span style="background-color: rgba(255, 255, 255, 0); text-align: -webkit-center; -webkit-text-size-adjust: auto;"><br></span></div><div style="text-align: start;"><span style="background-color: rgba(255, 255, 255, 0); text-align: -webkit-center; -webkit-text-size-adjust: auto;">The duration of a gust is usually less than 20 seconds. </span></div><br></body></html>