By using FNL reanalysis data, the routine observation data, the regional automatic station data, FY-2G data, Analysis of extreme rainstorm environmental field characteristics in eastern Xinjiang on July 31, 2018, and compared with the research results of torrential rain in Xinjiang and southern China.The results are as follows: The extreme rainstorm were in the stable two ridges one trough large-scale circulation background; It caused by elevated convection; The rainstorm zone were located in the right side of southwest jet stream inlet region in high altitude, the Confluence area on the 500 hPa from southwest stream before central Asia low vortex and south airflow From western Pacific subtropical high on the west side, front convergence zone of southeast low level jet stream outlet zone on the 700 hPa and the overlapping area of the negative variable temperature area behind the cold front on the ground map; Central Asia low vortex of 500 hPa, low level jet of 700 hPa and its anterior convergence area, strong frontal zone 800~600 hPa that the elevated convection were triggered; Strong convergence and high level strong divergence nearby the lower troposphere 700 hPa, it provides dynamic triggering conditions for the development of elevated convection, so that SW Warm and Wet Air Flow in the Front of Central Asian Low Vortex and water vapor bypasses and crosses the Qinghai-Xizang Plateau, from the Arabian sea, Bay of Bengal, South China Sea and Western Pacific and Convergence and concentration rapidly in rainstorm area, and constantly being lifted to the sky, it provides sufficient water vapor condition for extreme rainstorm.The extreme rainstorm in this region is quite different from that in other parts of Xinjiang; There were also significant differences between the elevated convection system in south China.
Xiaocui ZHUANG
,
Boyuan LI
,
Rong QING
,
Ruqi LI
,
Yunhui ZHANG
,
Songzhu BAI
. Analysis on the Causes of an Extreme Rainstorm in the Eastern Xinjiang[J]. Plateau Meteorology, 2020
, 39(5)
: 947
-959
.
DOI: 10.7522/j.issn.1000-0534.2019.00081
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