Diagnostic analysis of a rare persistent rainstorm in late autumn in Hunan province

doi:10.14088/j.cnki.issn0439-8114.2020.15.007

Abstract

Abstract: Based on the conventional meteorological observation data and 1 °× 1 ° NCEP reanalysis data, a comprehensive analysis of a rare continuous heavy rain weather process occurred in the central and northern Hunan province from October 27 to November 1 was carried out, 2014. The results showed that the intensity and location of the subtropical high, the activity of the low trough in the Bay of Bengal, and the east-west high-low situation were the large-scale circulation backgrounds that caused the heavy rain process; The high-level divergence, low-level convergence and strong ascending motion provided powerful dynamic lifting conditions for the rainstorm; The establishment and maintenance of the low-level southwest jet provided abundant water vapor conditions for the rainstorm. During the whole heavy rainfall process, the cold air activity was weak, and the rainstorm mainly occured in the water vapor convergence area on the left side of the southwest jet. The heavy rain in late autumn mainly occured in two stages. The first stage was the stable atmospheric stratification under the influence of the cold air from the east road, with a long duration; The second stage was the invasion of the cold air from the west road, with a short duration under the convective instability.

Key words: heavy rain in late autumn, southwest low vortex, high and low jet, uncommon, Hunan province

CLC Number:

P446

LIU Hong-wu, TANG Lin, LIAO CHUN-hua, WANG Qing-xia, DENG Zhao-ping. Diagnostic analysis of a rare persistent rainstorm in late autumn in Hunan province[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(15): 37-43.

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