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Analysis of the Causes of a low Cloud and low Visibility Weather at Cangyuan Washan Airport

Advances in Aerospace Science and Technology 2023年第2期8卷 11-20页

作者： Yahan Zhong Wancheng Zhang Juzhang Ren Man Wang Yun Tao Yunnan Institute of Meteorological Sciences Kunming China Research Center for Disastrous Weather in Hengduan Mountain and low-Latitude Plateau CMA Kunming China

At 11:00 am on August 5, 2017, Cangyuan Washan Airport experienced low cloud and low visibility weather, accompanied by aircraft turbulence, which affected the normal operation of flights, which was closely related to the meteorological conditions at that time. Using the hourly reanalysis data of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5), including Geopotential height, temperature, precipitation, wind field, specific humidity, vorticity and other elements, with a spatial resolution of 0.25° × 0.25°, this paper focuses on the horizontal distribution and vertical configuration of various physical quantities before and after the occurrence of low cloud and low visibility weather at the airport. The results indicate that the main influencing system of this low cloud and low visibility weather is the westward tropical depression. Before the occurrence of low cloud and low visibility weather, low-level water vapor converges and is accompanied by precipitation. The temperature decreases with precipitation, the near-surface wind direction changes, and the wind speed decreases.

关键词： low clouds low Visibility Vertical Velocity

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Analysis of a Complex Weather Process and Services at Shanghai Pudong International Airport

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Meteorological and Environmental Research 2018年第3期9卷 30-34页

作者： Xu Xiaohui Yao Weidong Meteorological Center of East China Regional Air Traffic Management Bureau Civil Aviation Administration of China

A complex weather process at Shanghai Pudong International Airport during April 8-9 in 2017 was analyzed deeply to study the causes of low clouds and convective weather and how to provide services for control in the complex weather situation. The results showed that when clouds and visibility were low,the situation of wind fields should be analyzed carefully to forecast the weather more accurately. The actual situation of the weather was in line with the numerical forecast on the day,and numerical forecast had certain reference value for convection forecast. The prediction of cloud height was not as perfect as expected on the day,but corresponding services were provided to the regulatory agencies 3 h early,and they had sufficient time to make decisions. The meteorological services have also been well received by the regulatory authorities,which further explains the importance of forecast in advance.

关键词： low clouds Convection Wind fields Numerical forecast

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