Definitions for "PEAK GUST"
The highest "instantaneous" wind speed recorded at a station during a specified period, usually a 24hr observation day.
The highest “instantaneous†wind speed recorded during a specific period.
In United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.