天水一次区域性冰雹天气过程分析

Analysis of a Regional Hail Weather in Tianshui

利用天水常规观测资料、多普勒天气雷达资料,从产生雹暴天气的背景条件和气象要素上入手,分析2015年5月30日天水地区发生的一次区域性冰雹过程的雷达反射率因子及其产品的特征和环境场的特点。结果表明,此次降雹过程是在西北气流控制下,小股冷空气补充南下,冷锋过境产生的;冷锋、露点锋是此次过程的主要影响系统。雷达反射率因子有明显的钩状回波;强回波有明显的回波悬垂结构;较强的垂直上升运动和深层的垂直风切变是产生强回波的前兆,有利于冰雹的产生。

Using the conventional observation data of Tianshui and the Doppler weather radar data,the radar reflectivity factor and its characteristics and environmental field characteristics of a regional hail occurred in Tianshui area on May 30, 2015 were analyzed from the background of hail storms weather and meteorological elements on the start.The results showed that the hail process was under the control of the northwest airflow, the small shares of cold air supplemented south and cold front transit.Cold front and dew-point front were the main impact system. The radar reflectivity factor had obvious hook echo;Strong echo had obvious echo overhanging structure.Strong vertical uplift and deep vertical wind shear were precursors of strong echoes that contributed to the generation of hail.