A study on the rainstorm that causes flight delays——An event of rainstorm over Sichuan Basin on July 11, 2018

Abstract

Abstract: Rainstorm is one of the main bad weathers that cause large-scale flight delays. The rainstorm in Sichuan Basin on July 11, 2018 (7.11 rainstorm hereafter) was analyzed using the national hourly encrypted precipitation data, National Centers for Environmental Prediction (NCEP)-final reanalysis data(FNL) and FY-2E infrared cloud chart, by the methods of weather analysis and medium scale numerical simulation.The results showed that the heavy rainfall on July 11 occurred at 02 ∶ 00 am and 08 ∶ 00 am on the 11th. The former is a night rain, and the latter is a daytime precipitation. At 500 hPa, the Baikal Lake vortex extends to the Westerly trough of Sichuan Basin, at 700 hPa, the Southwest vortex and shear line located in the basin, the West Pacific Subtropical High (WPSH) and typhoon Maria are the main weather patterns that affect the 7.11 rainstorm. The mesoscale numerical model weather research forecast(WRF) can better simulate the spatial distribution of the 24-hour accumulated precipitation, but the simulation result of daytime precipitation is not good. In addition, the duration of the southwest vortex simulated by the model is shorter than that of the actual situation.

Key words: rainstorm, diagnostic analysis, numerical simulation, Sichuan Basin, Southwest vortex, flight delay

CLC Number:

P447
V355

LIU Haiwen , HOU Shaoyu , MAO Jiangnan , GONG Yuanfa. A study on the rainstorm that causes flight delays——An event of rainstorm over Sichuan Basin on July 11, 2018[J]. Journal of Civil Aviation University of China, 2022, 40(2): 6-13.

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