2015年7月23日武汉一次暴雨天气过程分析
Analysis of a Heavy Rain Weather Process in Wuhan in July 23, 2015

2015年7月22日~24日湖北省出现了大范围强降水天气，其中在7月23日武汉出现了极端暴雨天气。本文利用地面和高空观测资料，阐述了此次暴雨天气的实况，分析了此次暴雨天气的环流背景，并且从中尺度角度详细分析了此次过程大气中的水汽条件、不稳定条件，得到以下结论：此次暴雨过程降水强度大，范围广，时间空间分布很不均匀；从环流系统、影响系统和物理量方面分析得出：此次暴雨过程是由于副高减弱南退和低槽东移使得中低层切变南压，在低空切变线、西南低空急流、地面锋面的影响下，充足的水汽和不稳定能量造成的中尺度对流性降水；在卫星云图上，对流云团发展明显，是此次降水的直接制造者。
There was a large range of heavy precipitation weather in Hubei from July 22^nd, 2015 to July 24^th, and in July 23^rd an extremely heavy rain happened in Wuhan. This paper expounds the process of the heavy rain weather, analyzes the scale circulation background of the rainstorm and analyzes the process of atmospheric water vapor condition and instability condition in detail using the observa-tions of upper air and surface, then obtains the following conclusions: This precipitation was of high intensity, large scale and very uneven time and space distribution; the southward move of middle and low level shear line was caused by the southward recession and weaken of the subtropical high and low trough east movement, which led to this precipitation. The low level shear line, the southwest low level jet and the ground frontal cyclone are the main system producing this rainstorm, and the rainstorm process is the convective precipitation produced by mesoscale system. Adequate wa-ter vapor and unstable energy and suitable lifting conditions resulted in the occurrence of the heavy rain, the sounding conditions and unstable energy of this precipitation are adequate; the accumulation of cloud cover over Wuhan before this precipitation was very obvious, which was the direct producer of this precipitation.