Analysis of the Causes of Hail in Shapotou District,Zhongwei City on September 8,2022
[Purposes]The causes of hail weather in Shapotou District of Zhongwei City on September 8,2022 were analyzed,and the predictability of hail was discussed to provide a better basis for hail forecast in the future.[Methods]Based on the conventional ground observation data,Micpas ground altitude data,radiosonde data and the time-by-hour reanalysis data of ECMWF ERA5,this paper analyzes a hail weather in Shapotou District of Zhongwei City on September 8,2022.[Findings]The hail process was a"two trough and one ridge"circulation situation,which was influenced by the upper Inner Mongolia cold vortex trough and the southerly air flow in front of the trough,the low-level jet at 700 hPa,the shear at 850hPa,and the convergence of the surface wind field.During the process,the pseudo equivalent poten-tial temperature of 850～500 hPa in Shapotou District of Zhongwei City decreases with height,and the temperature difference between 850～500 hPa and 700～500 hPa is large,and the upper part is cold and the lower part is warm,and the atmospheric convection is strong.From the water vapor condition,the middle troposphere water vapor condition is better.On the radiosonde map,CAPE value,K index,SI in-dex,-20℃layer height,0℃layer height and other indicators meet the characteristics of strong convec-tive weather.[Conclusions]In the afternoon of September 8,there was a strong unstable energy,com-bined with a strong lifting movement in the middle and lower troposphere and a good water vapor condi-tion in the middle layer,and there was hail in Shapotou District of Zhongwei City,accompanied by a short-term rainstorm and thunderstorms and strong winds.
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