A statistical analysis of gusty wind conditionally sampled in the Shonai plain

Abstract

We observed wind velocity with 12 supersonic anemometers in the Shonai plane. We conditionally sampled gusty winds whose instantaneous velocity were more than 20 m/s and examined statistical features of them. Most of the gust events concentrated in winter and their main wind direction was from Northwest to West. The frequency of the gust events increased daytimes. Mean velocity increments and mean duration of the gust were 16 m/s and 7 min, respectively. The horizontal scale of the gusts were less than several hundreds meter.