泰安市2009年11月12日暴雪天气过程分析

2009年11月12日泰安市普降暴雪,范围大,强度强,降水比较均匀,阴雨天气持续时间长;积雪厚度深。此次降雪主要受中支槽东移影响,沿海高压的阻滞作用造成降水时间长、强度大。低层2支急流带来丰沛的水汽。低层冷空气和前期持续升温为这次过程积蓄大量能量。从物理量场来看,暴雪落区发生在正涡度区,强低空辐合、高空辐散区及700 hPa强上升速度区三者的重合区。

Analysis on Snowstorm Process in Taian on November 12,2009

Snowstorm occurred in Taian on November 12,2009 in a large scale with strong intensity,uniform precipitation,long duration of cloudy and rainy weather and deep snowdrift.It was mainly influenced by middle branch trough moving eastward and retardation of costal high pressure.The low-level jet supported enough water vapor.The low-level cold air and continuous rising of temperature supported enough energy.Analyzing from the physical parameter field,the snowstorm occurred in the positive vorticity area that was the overlay zone of strong low-level convergence,upper-level divergence and 700 hPa strong rising zone.