The Synoptic and Climatic Characteristic Studies of Thunderstorm Winds in Beijing
北京地区雷暴大风的天气—气候学特征研究

Synoptic and climatic characteristic of thunderstorm winds in Beijing are studied by using the observational data and sounding data during 1990 to 2004. The obviously diurnal characteristics was showed to thunderstorm winds occurrence. The ambient circulation, sounding structure and convection parameters are studied to discover the most favorable condition for the occurrence of the thunderstorm wind in Beijing. The instability index and energy parameters are studied as well. It shows that warm and wet at low level, dry and cold at middle level, strong convective instability, and relative strong vertical wind sheer are favorable to thunderstorm wind occurrences. More convective parameters associated to strong storms are also studied, such as the best convective available potential energy (BCAPE), downdraft convective available potential energy (DCAPE), Storm-Relative Environmental Helicity (SREH), Wind Index (WINDEX), Storm Severity Index (SSI), Deep Convective Index (DCI) and so on, which are important to the potential development of the strong convection in Beijing.