Analysis of the June 2016 Atmospheric Circulation and Weather
The main characteristics of the general atmospheric circulation in June 2016 are as follow： the circulation of polar vortex in the Northern Hemisphere was in a singlepole pattern, which is stronger than normal years. The 500 hPa geopotential height presented the distribution of a fourwave pattern in the high latitude of Northern Hemisphere. The subtropical high of Northwest Pacific was stronger and larger than the climatological normal. The monthly mean temperature was 20.7℃， 0.7℃ higher than the corresponding period of normal years. The mean precipitation was 117.0 mm, 17.2% more than normal 99.8 mm. The temperature and precipitation are both the third highest values since 1961. Seven rainfall processes occurred this month. Torrential rainfalls occurred frequently in the regions of Yangtze River and Huaihe River as well as the northern part of South Yangtze River Region, causing many places in the middle and lower reaches of Yangtze River to have suffered from serious floods. Meanwhile, severe convective weather was seen in North China, the regions of Yellow River and Huaihe River, and the northern part of Yangtze River. One severe tornado disaster occurred in Yancheng of Jiangsu Province, causing serious casualties. None tropical cyclone was initiated over the Northwest Pacific.