Abstract:The freezing rain is a low-probability disastrous weather, which can cause severe impact on the transportation, the power system, and the civilization. By analyzing the synoptic situation and the variation of cloud microphysics factors during the freezing rain episode during January 25th~26th, 2018, the weather conditions for this freezing rain episode is investigated. By adopting the numerical WRF model coupled with the improved Ramer parameterization scheme, the prediction of this episode is casted and examined in this study. The conclusions are as follows: 1) An oscillating shear line is formed in the upper air over the Guizhou-Hunan-Jiangxi region by the interaction of the warm wet air and the cold dry air. A thermal inversion layer is formed, and the surface temperature is lower than 0℃, ensuring a favorable weather condition for the freezing rain. 2) Three meteorological criteria must be met for the freezing rain formation: a warm layer of certain thickness; a high enough liquid water concentration; and the surface temperature lower than 0℃. During a freezing rain episode, the three meteorological criteria may not be satisfied all the time, thus it may be discontinuous, with raining or snowing mingled in it. 3) The WRF model coupled with the improved Ramer parameterization scheme performs well in the freezing rain prediction. The average TS score has reached 0.52 for this episode. The present research has important value for the study on freezing rains, and is providing a valid theorical support for the disaster prevention and reduction of the transportation and power system.