why gusting is to emit a sudden and abdunt flow
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A wind gust is a sudden, seconds-long burst of high-speed wind that's followed by a lull. Whenever you see wind gusts in your forecast, it means the National Weather Service has observed or expects wind speeds to reach at least 18 mph, and the difference between the peak winds and the lulls to vary by 10 mph or more. A related phenomenon, a squall, is (according to the National Weather Service), "A strong wind characterized by a sudden onset in which the wind speed increases at least 16 knots and is sustained at 22 knots or more for at least one minute."
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