CAUSE ANALYSIS OF HIGH TEMPERATURE AND DROUGHT IN 2006'S MIDSUMMER IN YUNNAN PROVINCE

According to the analysis of the heavy high temperature and drought of Yunnan Province in the midsummer of 2006.The main causes that led to high temperature and drought in Yunnan were found that the position and intensity of the Western Pacific subtropical high at 500 hPa located to the west and north and stronger than average.The water vapor from Bay of Bengal brought to Yunnan and Sichuan was inhibited.The meridional circulation was weaker and zonal circulation was stronger than normal in the area of Asia and Eurasia.More obvious latitudinal circulation at middle high latitudes.OLR is higher in Bay of Arab Bay of Bengal South sea of China Yunnan and Sichuan and the convective activity was weakened.Yunnan kept warmer area at 850 hPa temperature,and there was no cold air brought to Yunnan Province in July and August.