Characteristic Analysis of Satellite Images of Thunderstorm in Tibet

Based on the FY2-C satellite and thunderstorms data from 2006 to 2008, thunderstorm’s characteristics were analyzed by channel differencing and cloud index methods in Tibet.The research results show that thunderstorms characteristic is obvious as a indicator in Lasa、Shigatse and Dangxiong.Concretely, TBB difference between IR1 and IR2 is from-5℃ to 5℃, and is from-10℃ to 10℃ between IR1 and IR3. FYCDI is from-0.11 to 0.28K. There is a distinct intensive reduction from the beginning to mature phase of thunderstorm in IR1 and IR3. Their TBB goes down 15℃, and to-70℃ within 1～2 hours. As the TBB difference between IR1 and IR2, most of them are from 0 to-5℃, and FYC_TS is close to 0 at the mature stage.