Analysis on the Causes of a Hail Weather in the Eastern Tarim Basin, Xinjiang, July 2018

7th Annual International Conference on Materials Science and Engineering

Qin, Rong^1 ; Song, Xuefei^2 ; Chen, Yanli^3 ; Jiang, Aihong^4 ; Chen, Haili^5 ; Yang, Xian^6

Xinjiang Meteorological Information Center, Urumqi

830002, China^1

Xinjiang Agro Meteorological Observatory, Urumqi

830002, China^2

Meteorological Bureau of Tiemenguan City, Tiemenguan

841007, China^3

Meteorological Bureau of Tumushuke City, Tumushuke

844000, China^4

Meteorological Station of Tarimu Region, Tiemenguan City, Yuli

841500, China^5

Xinjiang Meteorological Service Center, Urumqi

830002, China^6

关键词: Automatic weather stations;    Convection cell;    Convective weather;    Favorable conditions;    Near-surface layers;    Short-term forecasts;    Unstable conditions;    Wind directions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012112/pdf
DOI  :  10.1088/1757-899X/562/1/012112

来源: IOP

【 摘 要 】

Using high altitude/ground truth data, hourly data from Regional automatic weather stations, sounding data, NEF FNL data and Doppler radar data, the paper analyzes the causes of a hail weather process occurred in the eastern Tarim Basin on July 9, 2018. The results show that: (1) The split short wave in southern Siberia is the main influence system of the local hail weather in the eastern Tarim Basin. (2) The K index is a good indication for summer thunderstorms, which can be used as a discriminative indicator of convective weather occurrence in the region When K≥32°C; and the energy front and the unstable energy center of the K index provide sufficient energy and unstable conditions for the occurrence of hail weather. (3) When the convection cells moved to the Tarimu Region of Tiemenguan City, the wind direction gradually changed from the westerly wind to the east wind from the north to the south, and the wind speed convergence center near the ground layer coincided with the falling area where the hail occurred. (4) The emergence and strengthening of mesoscale ground low pressure has enhanced the convergence uplift movement of the near-surface layer to a certain extent, which provides favorable conditions for the occurrence of this hail weather. (5) Among the radar echo products, the rapid increase of VIL is a good indication for the short-term forecast of hail weather in this region.