豫西北一次持续降水天气过程分析

Analysis of a Continuous Precipitation Weather Process in Northwest Henan Province

利用NECP资料和常规气象观测资料,分别从天气形势演变、水汽、垂直运动等方面对2014年秋季发生在豫西北的持续降水过程进行了分析。结果表明:中高纬度西风带长波系统的稳定少动是导致豫西北地区连阴雨的主要原因之一;持续降水是大尺度环流相对稳定的背景下,天气尺度系统连续、重复出现造成的;西太平洋副热带高压的位置相对稳定使得西南暖湿气流和冷空气长时间在华北南部和黄淮地区上空交汇,是导致豫西北地区长时间维持阴雨天气的原因。

Based on the NECP data and the conventional meteorological observation data,the continuous rainy weather process in Northwest Henan in autumn of 2014 is analyzed from the aspects of weather situation evolution,water vapor and vertical movement.The results show that the stability and low movement of the long-wave system in the mid-high latitude westerly belt was one of the main reasons for continuous rainy weather in Northwest Henan;continuous rainy weather was caused by the continuous and repeated occurrence of the weather scale system under the background of relatively stable large-scale weather circulation.The relatively stable position of the western Pacific subtropical high made the southwest warm and humid airflow and cold air converge in the southern part of North China and the Huanghuai area for a long time,which was the reason for the long-term maintenance of rainy weather in the northwest of Henan Province.