Abstract:The main characteristics of the general atmospheric circulation in August 2015 are as follows: The polar vortex takes the form of eccentric pattern in the Northern Hemisphere.In the mid high latitudes of Asia, the circulation presents a two trough and one ridge pattern, and all of those are more intense than their climatological means.The subtropical high lies westwards and southwards, and its intensity is equivalent to or a little stronger than its average state during the corresponding time of the normal years. Meanwhile, the monthly mean precipitation amount is 105.1 mm, which is almost close to the normal value (105.3 mm). The monthly mean temperature is 21.1℃, higher than its climatological mean (20.8℃). In the first dekad of August, long lasting and large scale high temperature events occur around Jianghuai region. Five regional torrential rainfall events mainly happen in August.Four tropical cyclones are active over the Northwest Pacific Ocean and the South China Sea, but only one of them lands China. Drought continuously is found in North China, eastern part of northwestern China and central Inner Mongolia. In addition, many cities suffer from strong wind and hail disaster.