Torrential rain in warm sector occurred over Northwest China from 19 to 20 June 2013, with the maximum total rainfall of 258 mm and the maximum hourly rainfall of 65 mm, along with thunder and lightning. The evolution of mesoscale convective system was analyzed focusing on the development and propagation at Southwest side of Liupan Mountain, by using the data of satellite, CINRAD, automatic weather stations, the conventional observation, and NCEP/NCAR reanalysis data. The results show that, due to the bell-like terrain and the block of Liupan mountain, a low-level jet formed as long as 200~300 km at southwest side of the mountain on 700 hPa. The low level jet triggered the development of convective cloud band. The forward propagation of Meso-β-scale convective cloud cluster (MCS) was the major cause of Torrential rain. The radar echoes showed obvious characteristics of low center of mass warm cloud precipitation, the zonal distribution in north and south of strong echo monomer greater than 35 dBZ, the movement of convective cells with 1 time·h-1 along the low level jet from south to north. The significant train effect formed zonal torrential rain at southwest side of the Liupan Mountains.
ZHAO Qingyun
,
FU Zhao
,
LIU Xinwei
,
CHEN Xiaoyan
,
ZHOU Xiaojun
. Characteristics of Mesoscale System Evolution of Torrential Rain in Warm Sector over Northwest China[J]. Plateau Meteorology, 2017
, 36(3)
: 697
-704
.
DOI: 10.7522/j.issn.1000-0534.2016.00140
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