We simulate the low-temperature and freezing-rain/snow event in southern China during 25th—29th January 2008 by using the WRF model,and the results show that there appeared the coupling of lower and upper level jets over the middle and lower reaches of the Yangtze River and the area south of the river during the rain/snow episode;and the low level jet persistently transported warm/wet air towards the rain/snow area,where the low level moisture convergence promoted the occurrence and maintenance of large-sca...