惠州高潭一次特大致洪暴雨过程分析

2018年8月30-31日广东出现一次超历史记录的极端强降水过程，惠东高潭24 h雨量达1 056.7 mm，采用广东省区域雷达拼图产品、MICAPS实况、CFSR逐6 h再分析资料（水平分辨率0.5°×0.5°），以及广东省国家级地面气象观测站和区域自动站资料，着重分析了此次过程中

Flash flood forecasting:An ingred-ients-based methodology

Using data of regional radar mosaic products, MICAPS, 6-hourly reanalysis data of CFSR with horizontal resolution of 0.5°×0.5°, and data of national meteorological observatories and regional automatic stations in Guangdong Province, the train effect features of an extremely severe rainfall event in Guangdong with a record-breaking rainfall of 1 056.7 mm within 24 hours in Gaotan of Huidong from 30 to 31 August 2018 is analyzed. The result is shown as follows. The train effect took place in the environment of a favorable atmospheric circulation induced by slowly moving monsoon depression. The most remarkable characteristic was that the high value of vapor flux divergence and potential pseudo-equivalent temperature mainly appeared in the boundary layer below 925 hPa. The wind direction in the boundary layer near Shanwei gradually shifts from southwest to south. The air current produced an upward movement of convergence around the central region of Shanwei. The storm cells of the severe rainfall moved along with southwest monsoon and the Lianhua Moutain from southwest to northeast. Surface mesoscale convergence line, the pulses of southwest-south airflows and the special terrain distribution triggered the generation and development of the train effect. The conditions presented above have resulted in the extremely severe precipitation breaking historical records in Gaotan.