Analysis of a Type II Snowstorm Process Spring of 2022 in Ulanqab.

Based on the observation data of meteorological stations, Doppler radar observation data of Ulanqab City, and ERA-5 reanalysis data, a snowstorm process in Ulanqab City from March 17 to 18, 2022 was analyzed. The results show that this was a type II snowstorm process generated under the joint influence of upper trough and ground low inverted trough and frontal cyclone. The main period of snowfall can be divided into two time stages, and the total snowfall was more in the south and less in the north, which was consistent with that of average specific humidity field. Water vapor conditions provided by strong water vapor transport and convergence, strong upward movement shown by large vertical velocity field, and the suction action of highand low-layer divergence and convergence were the reasons for the hourly heavy snowfall on the 18"'. During the process, radar echoes were mainly sheetshaped, and composite reflectivity was 15 -25 dBZ in most areas. The zero speed line in the first period was positively "S" -shaped, and there was warm advection and southwest wind. On the morning of the 18"', after the cold front transited the city, Ulanqab City was gradually controlled by northwest wind, and the snow tended to end. [ABSTRACT FROM AUTHOR]