2017年1月辽宁一次暴雪天气过程分析

Analysis of a Heavy Snow Process in Liaoning Province in January 2017

利用地面自动站资料、NCEP再分析资料对2017年1月辽宁省一次暴雪过程的环流演变进行了分析。结果表明,此次降雪过程是冬季500 hPa高空槽前降水过程,高空槽的合并加深发展为此次降雪过程提供了良好的动力条件。850 hPa低空急流主要从华南地区沿西南方向延伸到辽宁,偏南急流向东北地区输送大量暖湿空气,为此次过程提供了丰富的水汽条件。地面系统上,蒙古气旋逐渐生成并加强东移,与此次辽宁地区降雪的形成与发展有密切联系。此次过程是北路蒙古气旋结合倒槽型降雪天气过程。

The circulation evolution of a heavy snow process in Liaoning Province in January 2017 was analyzed by using the ground automatic station data and NCEP re-analysis data. The re- sults showed that the snowfall process was the precipitation process in front of the upper trough at 500 hPa in winter. The consolidation and development of the upper trough provided good dynamic conditions for the snow process. The low- altitude,jet at 850 hPa mainly extended from south China to Liaoning along the southwest direction, and the southward ,jet sent a large amount of warm and hu- mid air to northeast region, which pro- vided abundant water vapor conditions for this snowfall process. Mongolian cy- clone gradually formed and strengthened eastward movement, which was closely related to the formation and development of this snowfall process. This snowfall process was caused by the Mongolia cy- clone and inverted trough.