关键词: 暴雨过程, 强回波带, 低空急流, 垂直液态含水量

Abstract: Based on the Doppler radar data in Yingkou, a heavy rain process in the south of Fuxin on August 19, 2010 was analyzed. The results indicate that a strong echo cell generated in Yixian county moves to the northeast and develops continually and strengthens, which forms a strong echo belt from Yixian county to Haertao of Zhangwu areas. The eastward movement of the strong echo belt is the main reason causing this process. The echo intensity, influencing duration and real precipitation are compared and analyzed. The relationship between the hourly precipitation and echo intensity is discussed. It shows that the hourly precipitation reaches 25 mm and 40 mm when echo intensity is between 35-45 dBz and between 45-50 dBz, respectively. The hourly precipitation can reach 50 mm when echo intensity exceeds 50 dBz, although echo influencing duration is short and less than 3 volume scanning periods. The occurrence and reinforcement of low-level jet provide sufficient water vapor and instability energy for this process and it makes the mesoscale system generation and development, which is the key factor causing the short time rainfall.

Key words: Heavy rain process, Strong echo belt, Low-level jet, Vertical integrated liquid water content