Abstract: Based on the hourly precipitation data collected from automatic weather stations over Anhui province and hourly TBB (Black Body Temperature) data from FY-2E meteorological satellite,the spatial-temporal distribution characteristics of short-time strong precipitation (STSP) in the flood season under different terrains over Anhui province and their relationships with the mesoscale convective activities were analyzed and spatial-temporal characteristics of the extreme STSP were discussed preliminarily.Results showed that the STSP occurs mainly in the mountain area of southern Anhui,followed by Dabie Mountains and the hilly area in the mid-eastern part of Anhui province,while least in Huaibei plain under different terrains during 2011-2015.The monthly variation of the STSP frequencies presents a single-peak pattern,i.e.the highest frequency is in July,which is different from the circumstances in the others months.Meanwhile,the pentad variation of the STSP frequency indicates a characteristic of multi-peaks and intermittency,that is,the STSP intensively occurs during the first pentad in June to the sixth pentad in August.Specifically,the pentad variation is largest in Huaibei plain and smallest in the mountain area of southern Anhui.In addition,the diurnal variations of the STSP frequency have a characteristic of single-peak and its peak value intensively appears in 15:00-19:00.Besides,the change characteristics of STSP frequency in the mountain area of southern Anhui and the hills in mid-eastern Anhui are similar to that averaged in Anhui province,i.e.the STSP mainly occurs in the afternoon.Although the STSPs in Huaibei plain and Dabie Mountains frequently appear in the afternoon,they also occur between 06:00-07:00 and 02:00-03:00 as well as 10:00,that is,a multi-peak pattern of STSP frequency is indicated in above-mentioned areas.The extreme STSP is dispersedly distributed in Anhui province and does not intensively occur in any area,and its time-varying trait with statistical regularity is similar to that of the STSP.More specifically,the extreme STSPs most intensively occur during 16:00-19:00 in the mountain area of southern Anhui in July,especially during the fifth pentad in July.They also occur in the hills in mid-eastern Anhui in July with the relatively uniform pentad variation,as well as at 02:00 in Dabie Mountains.Furthermore,the extreme STSP in Huaibei plain mainly occurs in August especially for the sixth pentad and it shows a duration variation without evident peak value.Thus,a certain corresponding relationship is possibly indicated between the STSP and the mesoscale convective activities and shows a local dissimilarity.

Key words: Terrain, Short-time strong precipitation, Spatial-temporal distribution, Black Body Temperature (TBB)