Mesoscale Observational Characteristics of Urban ShortDuration Rainstorms
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Abstract:
Based on the intensive automatic weather station and radar wind profiler data with high temporal and spatial resolution， the mesoscale observational characteristics of three shortduration rainstorm processes in Xingtai city are analyzed. The shortduration rainstorm was produced under the favorable largescale circulation background. The lower layer shear system， strong vertical wind shear between middle and low levels， surface low pressure and inverse trough were the favorable conditions for convergence and ascending motion. The warm wet air flow from southwest interacted with the cold air from the westerly winds and northeast backflow. The surface mesoscale shear was the trigger system， whose position was consistent with the intensive precipitation area. The intensive precipitation corresponded to the beginning， duration， and strength of east winds in the boundary layer. The surface ascending eastwinds were forced by the convergences resulted from the topographic forcing， and so the mesoscale convergence system was strengthened. The urban atmospheric thermal forcing and topographic effect triggered jointly the urban shortduration rainstorms.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.