甘肃陇东地区2017年2月19-21日强降雪天气成因及影响分析

对甘肃陇东2017 年2 月19-20 日强降雪天气成因分析得出，此次强降雪是在高空槽、冷锋、 南支槽、西南急流等有利的天气系统影响下产生的，水汽通量散度、散度场等物理量变化对应降雪天 气发生发展，引发该地区暴雪天气。

Analysis on the Causes and Effects of Heavy Snowfall in Longdong Region of Gansu Province from February 19 to 21, 2017

Based on the analysis of the causes of heavy snowfall in longdong, gansu province on February 19- 20, 2017, it is concluded that the heavy snowfall was generated under the influence of favorable weather sys? tems such as high altitude trough, cold front, south branch trough, southwest jet stream, etc., the variation of moisture flux divergence, divergence field and other physical quantities correspond to the development of snowfall weather, causing blizzard weatherin this region.