2011年4—10月我国主要暴雨天气过程简述

Important heavy rain processes in China from April to October in 2011

利用MICAPS系统日降水资料和常规天气图资料,以1981—2010年30 a平均降水量为气候态,统计了2011年4—10月我国的主要暴雨天气过程,并对各主要暴雨过程的影响系统、出现时段、范围及累积降水量进行概述。统计结果表明,2011年4—10月我国共出现172个暴雨日、125次区域性暴雨,38次主要暴雨天气过程。汛期主要气候特点是,长江中下游春季干旱,6月暴雨频繁,部分地区旱涝急转;夏秋季西南、江南伏秋旱严重;9月华西秋汛显著;9月底至10月中,海南、两广暴雨强烈。

Based on MICAPS daily precipitation data and operational synoptic chart,important heavy rain processes in China from April to October in 2011 were selected by comparing with the 30 a mean precipitation from 1981 to 2010,and a brief introduction on the synoptic system,rainfall occurrence time,rainfall area and accumulative amount of precipitation of these processes is presented.The statistical results indicate that there were 172 heavy-rain-day,125 regional heavy rain and 38 important heavy rain processes in China from April to October in 2011.The middle and lower reaches of Yangtze River experienced severe drought in spring and then the frequent heavy rain caused flood in June.Drought occurred in the southwest China and the south of the Yangtze River in summer and early autumn.The west China had a severe flood seasonin autumn.Hainan,Guangdong and Guangxi provinces experienced severe heavy rain processes in the late September and middle October.