Abstract:Based on conventional meteorological observation data,ERA5 0.25°×0.25° reanalysis data,encryption data of automatic weather station,high-precision DEM data and radar data,this paper analyzes the causes and characteristics of two heavy rainstorm processes caused by typhoon "Rumbia" in Lushan area in 2018.The results show that:1) before the typhoon landed,the short-term strong convection weather appeared in Lushan due to the influence of the typhoon.The terrain uplift of the windward slope did not cause strong precipitation in this area,while the leeward slope strengthened the convective system due to the cooperation of the friction turbulence of Lushan Mountain and the amplitude of the downhill airflow,forming a medium γ-scale convective system.The strong short-time heavy rainfall occurred in the places where the system passed.2)After the landfall,under the influence of typhoon low-pressure shear,continuous and strong precipitation appeared under the action of topographic uplift in Lushan Mountain.The precipitation was stable from the windward slope to the top of the mountain,and the increase of precipitation in Lushan Mountain terrain was very obvious.Under the influence of typhoon,the meso-γ scale system corresponding to the upwind area of Lushan leeward slope is the main cause of short-term heavy precipitation in Lushan leeward slope,which can be used as an important index in the short-term and imminent forecast of typhoon precipitation.
杨超, 徐洁玲. “温比亚”台风低压引起庐山大暴雨特征分析[J]. 气象水文海洋仪器, 2023, 40(3): 90-92.
Yang Chao, Xu Jieling. Analysis of heavy rain in Lushan caused by the typhoon low pressure of Rumbia. Meteorological Hydrological and Marine Instrument, 2023, 40(3): 90-92.
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