Analysis of the September 2016 Atmospheric Circulation and Weather
The main characteristics of the general circulation in September 2016 are as follows. The polar vortex of the Northern Hemisphere presented a single pattern with stronger intensity. In the midhigh latitudes of Eurasia, the circulation presented a twotrough and oneridge pattern. The subtropical high in Northwestern Pacific lay westward and northward, and its intensity was stronger than its average state during the corresponding time of the normal years. Meanwhile, the monthly mean precipitation amount is 78.9 mm, which is more than its normal value (65.3 mm) by 20.8%. The monthly mean temperature is 17.7℃, 1.1℃ higher than its climatological mean (16.6℃), which is recorded as the second high value since 1961. Three regional severe precipitation events happened in September, two of which were caused by tropical cyclones or typhoons. In September, seven tropical cyclones were generated over the Pacific and the South China Sea, and Typhoon Meranti (1614) and Megi (1617) made landfall over Fujian Province, China, carrying continuous heavy rains to many places. Sichuan Province and Yunnan Province received autumn rain notably so that serious flood disasters occurred in some locations. In addition, the drought condition in the southern part of Huanghuai Region and northwestern part of Hubei Province got relieved.