南昌市2月一次持续降水天气过程诊断分析

Diagnostic Analysis of a Continuous Precipitation Process in Nanchang in February

利用常规气象资料对2015年2月下旬南昌市一次持续性降水天气过程进行诊断分析。结果表明:欧亚大陆上空为两槽两脊形势,孟加拉湾活跃的南支波动不断输送西南暖湿气流,槽后西北气流引导冷空气不断扩散南下,且副高偏强使得南支槽前的西南气流明显加强,因此冷暖空气的交汇变得频繁,有利于后期持续性的降水。

Using conventional observed datum, the authors analyzed reasons of a continuous precipitation process in Nanchang. The results showed that there were two trough and two ridges over Eurasia, and the active South Branch of the bay of Bengal continuously delivered southwest warm moist air flow to Nanchang, and the northwest air flow after the trough leaded the cold air southward, and the strong subtropical anticyclones before trough made the southwest airflow obviously strengthened, which helped the continuous precipitation process.