Frequency and Environmental Features of Gust in Shonai Plain in Winter

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  • 冬季庄内平野における突風の発生頻度と環境特性
  • トウキ ショウナイ ヘイヤ ニ オケル トップウ ノ ハッセイ ヒンド ト カンキョウ トクセイ

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Abstract

Meteorological observations of gust were carried out in Shonai Plain using X-band Doppler radar, anemometers, surface weather stations from December 2007. Based on the detected gusts accompanied with snowclouds, the meteorological features of gusts were revealed. Approximately 50 % of the detected gusts exceeded the wind speed of 20 m/s. Almost of the gusts were accompanied with convective radar echoes. Pressure jump of 0.3 hPa and temperature drop of 0.5 ℃　in average were recorded at the time of the gusts with convective echoes. Most of the gusts occurred within 10 km from the center of the echoes. These results implied that the drag force of graupel particle was an important factor of the downdraft (snowburst) and surface gusts. The layer of convective unstable up to 700 hPa was necessary for the developing of the convective clouds that brought the surface gusts as the environmental conditions.

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