东风低空急流暴雨的中尺度分析

A Mesoanalysis of a Heavy Rainfall in Low-level Southeaster Jet

东风低空急流暴雨在湖北比较少见。使用卫星云图、武汉多普勒雷达资料和地面中尺度资料,针对2004年6月4～5日发生在湖北中东部地区的一次东风低空急流暴雨过程进行了中尺度分析,得到:(1)东风低空急流暴雨是在有利的大尺度背景场条件下,在特定的地域触发产生的;(2)东风低空急流在暴雨的形成和发展中起到重要的作用;(3)东风低空急流暴雨是由中尺度回波团和中尺度复合体造成的;(4)东风低空急流暴雨是在多种尺度天气系统相互作用的情况下发生发展的,而中小尺度系统是其产生的最直接的系统。

The heavy rain in the southeasterly jet in the low-level occurs less in Hubei Province. A mesoscale analysis of this kinds of heavy rain occurred on 4th-Sth of June, 2004 in east-central part of Hubei Province is conduced with the satellite pictures, Doppler radar data and surface mesoscale observations. It was found that （1） the heavy rain was produced in the favorable scale background and the special region. （2） The low-level jet plays an important role in the development of the heavy rain. （3） The heavy rain was directly produced by the meso-scale echo mass and complex ; （4） the meso-scale system was one of the most directly affection systems of the heavy rain.