宜春地区一次强降水天气过程分析

利用MICAPS资料，对2007-06-24-27宜春地区出现的一次强降水天气过程，就高空环流形势、中低层水汽条件和温度场分布特征进行分析，结果表明：高空低槽东移、副热带高压东退并南撤、中层低涡生成、中低层切变生成与维持的形式，这些动力条件易出现强降水天气。但宜春上游地区出现的高温形成的干暖气团较强，该温度脊伸到长江中下游地区，隔断了北方干冷空气与南方暖湿气流在本地的直接交汇，导致宜春未出现区域性暴雨，而出现局地强对流和强降水天气。同时因为干暖气团减弱了暖湿气流水汽的影响作用，又促使强对流天气出现强雷电特征。这些结果可对今后宜春地区强降水预报和气象服务提供有益的参考依据。

Analysis of a heavy rainfall weather process in Yichun

By means of MICAPS data of a heavy Yichun, upper air circulation situation and vapor rainfall weather process from June 24 to 27,2007 in conditions in lower middle level as well as distribution features of temperature field are analyzed. The results show that upper trough moving eastward, subtropical high moving down east and going down south, the middle vortex being produced, shear being produced and keeping in lower middle level, these would offer favorable term for the construction of a heavy rainfall. The severe convection weather appears when the warm-dry-air growing up in the upper area of Yichun and the temperature ridge reaches to middlelower Yangtze area. Then,the native intersection of northern colddryair and southern warmwet air is obstructed, which causes local severe convection and rainfall, not leading to regional rainstorms in Yichun. The water vapor is weakened because of warmdryair effect, at the same time it has severe thunderstorm character in the severe convection weather. According to these results, it will be working in strong precipitation forecast and weather service.