副高控制下的一次暴雨过程分析

Analysis of a Rainstorm Process under Subtropical High

通常情况下副高控制下的稳定层能抑制对流的发展,天气晴好。但有极少数的局地强降水,是发生在大尺度高压脊附近。本文通过对2004年8月10日阳泉地区在副高控制下的暴雨天气从环流背景、物理量特征等方面,进行了综合分析和探讨,结果表明,当低层水汽充足,局地大气具有潜在不稳定能量和适当的触发条件时,在500hPa副热带高压内部也会出现中尺度暴雨云团,产生强降水。

A rainstorm weather under subtropical high in Yangquan on August 10, 2004 were analyzed and discussed from circulation background, characteristic of physical variables and so on. The results showed that meso -scale rainstorm clouds can appear in subtropical high of 500hpa and create strong precipitation when the water vapor of bottom layer is sufficient, the local atmosphere has the latent unstable energy and suitable triggers condition.