“7.28” 渭河区域性大暴雨天气过程分析

The Analysis of Regional Heavy Rain Weather Process in Weihe on “7.28”

摘要:

应用常规气象观测资料、FY-2D气象卫星资料、雷达资料,对2011年7月28—29日发生在陕西渭河流域的强降水天气进行分析，结果表明：副热带高压加强北抬，高原低槽东移，副热带高压外围暖湿气流与高原槽前西南气流合并，为暴雨形成提供了有利的条件；低层切变线、低涡、低空急流是暴雨产生的主要影响系统；卫星云图上在低槽云系中有暴雨云团特征；雷达反射率因子强回波与液态含水量大值区总是与大降水对应。

Abstract:

Abstract: Applying the conventional meteorological observation data, the FY-2D meteorological satellite data, radar data to analyze the strong precipitation weather occurred in Weihe basin of Shaanxi province on July 28 to 29 , 2011. The results show that subtropical high strengthening northward, plateau low trough move to eastward, the merging of the edge of moist airflow of subtropical high and the plateau trough southwest airflow to provide favorable conditions for the rainstorms; The low level shear line, vortex and low-level jet were the main influencing system of rainstorm; Satellite image in low trough clouds have rainstorm cloud characteristics; Radar reflectivity factor strong echo and liquid-water content value are always corresponding with the strong precipitation.