2014年8月抚顺一次暴雨天气过程分析

Analysis on a Rainstorm Process in Fushun in August 2014

利用常规观测、加密自动气象站以及NCEP/NCAR再分析资料，分析了2014年8月24—26日抚顺暴雨过程。结果表明，此次暴雨过程具有持续时间长、影响范围广的特点。其降水具有稳定性和对流性混合性特点。地面低压倒槽、低层切变线和500 hPa西风槽是降水的主要影响系统。850 hPa无低空急流，水汽输送条件不利，但高空急流较为明显，高空水平和垂直辐散为降水产生提供了条件。此次暴雨850 hPa底层有较好的比湿场，为降水提供了较好的水汽条件。24—25日抚顺地区K指数达到34~36℃，为降水提供了不稳定能量。降水前期，抚顺处于Ω形假相当位温场高值区内，为降水提供了高温高湿条件。地形对局地强降水有增强作用。

This paper analyzed a rain-storm process in Fushun during August 24-26 in 2014 according to the data from conventional observation, encrypted automatic weather station and NCEP/NCAR reanalysis data. The results re-vealed that this rainstorm lasted for a long time and affected an extensive area, characterized by both stable and convec-tive precipitations. The storm was affect-ed by an inverted trough of low pressure, a low-level shear line and a 500 hPa westerly trough. No low-level jet was formed at 850 hPa, which was not con-ducive to the water vapor transport. However, due to the strong high-altitude jet, the horizontal and vertical diver-gence made the precipitation possible. The specific humidity field formed at 850 hPa provided suitable water vapor conditions for this storm. The K index of Fushun region during August 24-25 in 2014 reached 34-36℃, which provided unstable energy for this precipitation. In the early period of this precipitation, Fushun was under the high-value area of an Ω-shaped pseudo-equivalent potential temperature field, which provided the high temperature and humidity condi-tions for the precipitation. In addition, the terrain in Fushun region enhanced heavy rainfall.