Characteristic Analysis of Short Time Heavy Rain in Yulin, China

Yiqing Xiao, Qiyuan Hu, Pingyun Li, Jing Yao
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Abstract

National Centers for Environment Prediction (NCEP) reanalysis data, automatic observation data, FY-2E satellite data and Doppler radar data are used to analyze a short-time local heavy rain in Yulin city, Shaanxi, China on August 7, 2018. The result shows that the strong convective weather occurred in peripheral subtropical high over west pacific, being caused by short wave disturbance, and surface convergence lines with positive pressure variation are corresponding to areas of short-time heavy precipitation. The degree of temperature change in cold pool caused by thunderstorm may decide the intensity of a short-time rainfall, and local topography plays an important role in extreme precipitation. Local water vapour accumulation and water vapour flux convergence in the middle and lower layers support adequate moisture condition in the process. Moving direction and development direction of mesocale convective cloud are in a line to develop the train effect, leading to local short-time heavy rain in Yulin city, Shaanxi, China.
榆林市短时暴雨特征分析
利用国家环境预报中心(NCEP)再分析资料、自动观测资料、FY-2E卫星资料和多普勒雷达资料,对2018年8月7日发生在陕西省榆林市的一次短时局地暴雨进行了分析。结果表明,此次强对流天气发生在西太平洋副高外围,由短波扰动引起,具有正压变化的地面辐合线与短时强降水区相对应。雷暴引起的冷池温度变化程度可能决定短时降水的强度,局地地形在极端降水中起重要作用。局地水汽积累和中下层水汽通量辐合为过程提供了充足的水汽条件。中尺度对流云的移动方向和发展方向与发展列车效应呈一条直线,导致陕西省榆林市局地短时强降雨。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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