Statistical Characteristics of Gusty Wind Conditionally Sampled with an Array of Ultrasonic Anemometers

Taniwaki, Ken; Sassa, Koji; Hayashi, Taiichi; Hono, Yoshihiro; Adachi, Kohsuke

doi:10.1007/978-3-642-28968-2_58

Cited by 1 publication

(2 citation statements)

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“…The coastal re gions of the Japan Sea generally have highfrequency WGNoTYs in winter (Fig. 10a), as indicated by Taniwaki et al (2012). This is likely because strong convective systems develop on the Japan Sea side in winter when cold air masses from the Eurasian Continent are transformed over the Japan Sea by large sensible and latent heat (e.g., Nagata et al 1986;Mashiko et al 2012).…”

Section: B Spatial Distributionmentioning

confidence: 96%

“…Kusunoki et al (2010) examined the frequency of wind gusts in the Shonai Plain on the Japan Sea side during a winter season and found it more than two orders of magnitude higher than that of tornadoes shown in Niino et al (1997). Taniwaki et al (2012) also detected more than 9,000 gust events in the Shonai Plain over three years using 12 ultrasonic anemometers, discovering that most of the wind gusts occurred in winter under prevailing northwesterly wind during a cold air outbreak. Tomokiyo and Maeda (2016) investigated gusty winds in Kyusyu Island, western Japan, using surface data at 123 weather stations and detected 1,298 wind gusts over five years.…”

Section: Introductionmentioning

confidence: 99%

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A Statistical Study of Wind Gusts in Japan Using Surface Observations

Mashiko

2019

Journal of the Meteorological Society of Japan

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In this study, the characteristics of wind gusts in Japan in the period from 2002 to 2017 were examined using surface meteorological data recorded at 151 weather observatories throughout Japan. This study does not focus on particular phenomena, such as tornadoes and downbursts, which cause wind gusts. A wind gust is defined on the basis of the gust factor and the amount of increase and decrease of the 3s mean wind speed from the 10min mean wind speed. A total of 3,531 events were detected as wind gusts. The frequency of wind gusts with more than 25 m s −1 averaged across all observatories is 0.97 per year, which is four or five orders of magnitude higher than the tornado encounter probability in Japan. The frequency of wind gusts in the coastal region is approxi mately three times higher than that in the inland area. Wind gusts occur most frequently in September and least frequently in June. Wind gusts have high activities during daytime, especially in the afternoon. Approximately half of the events are the typhoon-associated wind gusts (WGTYs), which occurred within a radius of 800 km from the typhoon center. Most of the WGTYs occur from August to October. Approximately half of the WGTYs occur in the right-front quadrant of a typhoon with respect to the typhoon motion. The frequency of WGTYs is high in western Japan, whereas the northern and eastern parts of Japan are characterized by a high frequency of wind gusts without a typhoon. In addition, persistent strong winds, which meet the same conditions as wind gusts but without a rapid decrease in the wind speed, were investigated. The frequency of such strong winds is high on the Japan Sea coast, especially in December. The effects of the observational environment on the frequency of wind gusts were also discussed.

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Section: B Spatial Distributionmentioning

confidence: 96%