Abstract
Based on the wind speed records obtained by 356-m-high Shenzhen meteorological gradient tower (SZMGT) during 2019–2020, 10 sets of typical intense thunderstorm outflow records were obtained by screening. This paper suggests that moving average period T=60s is a suitable choice based on the correlation between time-varying mean wind and fluctuating wind. In order to discuss the wind characteristics of thunderstorm flow more precisely, it is divided into ramp-up stage, peak stage, and dissipation stage, and the average wind characteristics and fluctuating wind characteristics are analyzed in detail. Analysis revealed the change of average wind angle is usually caused by the movement of the downburst. The shape of the downburst flow profile is time-varying and has certain differences from several empirical profiles. The dissipation stage is closer to synoptic wind in terms of the wind profile than the ramp-up and peak stages. The turbulence intensity of downbursts is not significantly related to the height, but it is more significantly related to the average wind speed as well as the gust factor.
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