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《Guangdong Meteorology》 2017-03
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Causation Analysis of a Yangjiang Extraordinary Rainstorm Triggered by Autumn Typhoon “Mujigae”

HUANG Xian-lun;ZHANG Hong-hao;HUANG Xiao-dan;ZHEN Qing;ZHANG Hua-long;Yangjiang Meteorological Office;Guangdong Meteorological Observatory;  
An extraordinary rainstorm in Yangjiang caused by the strong typhoon "Mujigae"is analyzed through a diagnostic analysis method by using conventional meteorological data,mesoscale automatic weather stations data and NCEP 1° × 1° reanalysis data. The results show that the extraordinary rainstorm is the combined effect of southerly and easterly airflow from the south of a subtropical high,cold air,a ground convergence line and special topography. Abundant moisture and instability energy are continuously transferred by southerly and easterly airflow,with continuous cold air effect and low-level convergence,which make the precipitation in Yangjiang last for long time and rainfall intensity stable. The interactions between the invading cold air and warm air cause the strongest vertical velocity in Yangjiang and reduce atmospheric stability. Due to the constant effect of the ground convergence line,low-level convergence is strengthened in Yanngjiang,and a top-down pumping is induced,providing dynamic lifting conditions for convective development.
【Key Words】: synoptics typhoon Mujigae extraordinary rainstorm autumn cold air surface convergence line Yangjiang
【Fund】: 广东省气象局科学技术研究项目基金(2014C09)
【CateGory Index】: P458.121.1
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