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Analysis of the October 2010 Atmospheric General Circulation and Weather

DAI Kan National Meteorological Center,Beijing 100081  
The following are the main characteristics of the general atmospheric circulation in October 2010.There were two polar vortex centers in the Northern Hemisphere.The circulation presents a fourwave pattern in middle-high latitudes,in which the strong Ural ridge corresponds to a large 40 gpm positive anomaly area.Strength of the Western Pacific subtropical high is weaker than normal years.The monthly mean temperature(10.1℃) is 0.5℃higher than the same period of normal years,and the mean precipitation(42.6 mm) is 15.1%above normal.The major weather events include:8 precipitation processes occuring,in which a rare heavy rain has struck on Hainan in the first and middle dekad of October: two tropical cyclones generated,with one super typhoon(Chaba,numbered 1013) landed in Fujian; in the last dekad of October,strong cold air outbreak across most areas of China;heavy fog aroused in the central and eastern China.
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