Abstract
A diagnostic analysis of the dust storm weather occurring in the western part of the Hexi Corridor from 27-30 June 2020 was carried out using Jiuquan city’s live data, as well as ECMWF numerical forecasts, and the NCEP reanalysis information was used to draw a theta dust storm model based on the routing principle. The results show that: 1.In the early stage of sandstorm, there was no precipitation in Suzhou and Jinta counties in March and April, which resulted in dry surface and thickened soil layer. These factors created favorable conditions for the occurrence of dust weather. 2.Development of unstable trough eastward in front of the ridge of Mountain Ural at 500 hPa, The cold high pressure is continuously strengthened in the process of moving, which is the large-scale system leading to the sandstorm. Thermal depression in front of ground cold front is the main cause for the outbreak of the severe sandstorm. 3.The beginning and ending time of the sandstorm can be accurately predicted by the simulation chart of sandstorm forecast, which has a good indication significance for the sandstorm forecast in the Hexi area.
Highlights
Sandstorm is a disaster weather caused by the combination of special backgrounds on the large scale circulation and various different scale weather system that is more harmful and occurs mostly in arid and semi-arid areas[1].For many years Chinese meteorologists analyze deeply the birthplace, transmission path and physical mechanism of sandstorm in China using a variety of datum and methods, and gain rather meaningful research outcomes
Li Qian[3]carried out weather dynamics diagnostic analysis of the formation process and weakening reason of very strong sandstorm occurred on April 23,2014 in the Hexi Corridor in Gansu province
Ling Li[4]analyzed the traits of strong sandstorm on March 19,2018 in the eastern of the Hexi Corridor.Mingrui Zhao[5]carried out a study on the occurrence time and frequency of sandstorm in Gansu Minqin.Xiazhong
Summary
Sandstorm is a disaster weather caused by the combination of special backgrounds on the large scale circulation and various different scale weather system that is more harmful and occurs mostly in arid and semi-arid areas[1].For many years Chinese meteorologists analyze deeply the birthplace, transmission path and physical mechanism of sandstorm in China using a variety of datum and methods, and gain rather meaningful research outcomes. Such as Yuying Chen[2]. We analyzed the vortical flows in vertical direction, potential tumble effect and the secondary vortical flows in horizontal direction the station to forecast the beginning and ending of the sandstorm and improve the precision of the model on sandstorm weather forecast by the V-3θ structure from June 27,2020 to June 30,2020 in Guazhou station
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