Comparative analysis of two impact systems in a snowstorm in Dalian

Abstract In this study, the two influence systems in a snowstorm that occurred January 2021 are analyzed using conventional observation, intensive snowfall observation data and NCEP-FNL 0.25°×0.25° analysis data. The results show that, first, westerly trough combined with surface convergence line sub cold front produces strong southern part of Liaodong Peninsula, then air moves southward into flow snowfall. When system has large water vapor flux, deep wet layer ascending motion, is accompanied by obvious warm tongue southwest Dalian pad inland, there frontogenesis process, heavy intensity advection closely related to amount snowfall: stronger advections, greater will be. combination mid-upper-level divergence negative vorticity positive near ground also an advantage for Cold exhibits local characteristics. Compared system, smaller area intensity. motion one focuses forecast Dalian.