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Analysis of the Cryogenic Freezing Rain and Snow Weather in Northern Guangdong Province at the Beginning of 2008

ZHANG Lu-qing LI Li RAO Gang-wei (Shaoguan Meteorological Bureau,Shaoguan 512026,China)  
Northern Guangdong encountered a rare cryogenic freezing rain and snow Weather at the beginning of 2008.The characteristics,climate background and weather situations are studied by using the disaster information,automatic and manual meteorological observational data,and NCEP/NCAR daily reanalysis data.The results show that the prolonged freezing weather is the main cause of huge losses in northern Guangdong Province;Long lasting convergence of warm and cold air mass near the Nanling Mountains led to the cryogenic freezing rain and snow Weather;The abnormal atmospheric circulation induced by La Ni- na event prepared the climate background;Warm and moist air toward the Nanling Mountains brought by the strong subtropical high and low-trough from Guangxi and Bay of Bengal,colliding against the strong cold air down form the north in the boundary layer,produced the inversion,which is favorable for freezing rain.Eccentricity of the polar vortex to East-Asia alos suggests the occurrence of such events.
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