Author(s)

XIAO Yunqing, ZHANG Chi, ZHAI Yingjia, TAN Zhiqiang, LI Xiaofan

Corresponding Author

ZHAI Yingjia

ABSTRACT

This paper makes a comparative analysis of the two rainstorm weather processes ("7.1 rainstorm" and "7.22 rainstorm" for The rainfall data of automatic station, the routine data collected by The indicative effects of deformation field intensity change and horizontal vorticity The indicative effects of deformation field intensity change and horizontal vorticity conversion to vertical vorticity during two heavy rains are analyzed emphatically. The results showed that in two processes, the shear line of "7.1 rainstorm" is in the south and the shear line of the "7.22 rainstorm" process is in the north, which make the location of the two storms different. The location of the large value center of the 700 hPa deformation field and the occurrence of the rainstorm are synchronized When the deformation field large value center moves to the position of the When the deformation field large value center moves to the position of the shear line, a medium cyclone is generated on the shear line, which promotes the generation of heavy rain. The maximum value of the conversion from horizontal vorticity to vertical vorticity appears before the rainstorm, and the intensity of the rainstorm is the maximum value of the conversion from horizontal vorticity to vertical vorticity appears before the rainstorm, and the intensity of the rainstorm is strongest after 6h-8h, which can indicate the forecast of the rainstorm. The large value center of the vorticity conversion item in the "7.1 rainstorm" process is located in the west of Helan mountain and extends to the northeast of Ningxia. The large value center of the vorticity conversion item in the "7.22 rainstorm" process moves to the direction of Liupan mountain in Guyuan and Then stagnated and disappeared.

KEYWORDS

Heavy rain, Deformation field, Vorticity conversion, Comparison analysis