Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 3: 767 - 776

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00068

Propagation Characteristics of Mesoscale Convection System in an Event of Severe Convection Rainstorm over Both Sides of Liupanshan Mountains

  • ZHAO Qingyun ,
  • ZHANG Wu ,
  • CHEN Xiaoyan ,
  • GOU Shang
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  • Ministry of Education Key Laboratory for Semi-Arid Climate Change, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Gansu, China;Lanzhou Center Meteorological Observatory, Lanzhou 730020, Gansu, China

Received date: 2017-06-24

  Online published: 2018-06-28

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Abstract

Constrained by the subtropical anticyclone at 500 hPa, a severe convection rainstorm process was taking place in the region of middle-east part of Gansu province and the Central Shaanxi Plain from 19:00 Aug 24 to 08:00(Beijing Time) Aug 25, 2016. Arising rainstorm in 19 counties, with the maximum amount of daily precipitation of 158.7 mm and the highest 79.1 mm per hour, accompanied with lightning. It presented the features of a typical severe convection weather. Based on the data of satellite, radar, high resolution ground-base observations, ECMWF, NCEP and routine measurements, the occurrence and development of the mesoscale system, which was the main cause inducing the short time heavy precipitation, were analyzed, as well as the propagation characteristics of Mesoscale Convection System (MCS). The results show that there were two MCSs which were the main causes of the rainstorm. The occurrence and development of the MCS was close linked to the Convergence Line (CL) near the surface. The transmeridional CLs were taken shape near both westside and eastside of Liupanshan mountains due to the Shearing Disturbance(SD) in dynamical fields at low level, the Thunderstorm Cell (TC) was developing intensively near to the CL and moving southward with it overall. The westside CL had impact on the central part of Gansu. The eastside CL split in two parts, east section and west section. The first one moved continuously to southward affecting Longdong of Gansu, the second one changed into the north-south trending CL due to the complicated topography, while prevail north airflow turned to northwest in the west of the Central Shaanxi Plain. The TC moved from west to east along the terrain with the CL. Appropriate dynamical and thermal factors played an important role in the process of the enhancement of MCS and change of propagation direction over the east side of Liupanshan Mountains.

Key words： Surface convergence; topography; propagation of conve; convection clouds; severe rainstorm

Cite this article

ZHAO Qingyun , ZHANG Wu , CHEN Xiaoyan , GOU Shang . Propagation Characteristics of Mesoscale Convection System in an Event of Severe Convection Rainstorm over Both Sides of Liupanshan Mountains[J]. Plateau Meteorology, 2018 , 37(3) : 767 -776 . DOI: 10.7522/j.issn.1000-0534.2017.00068

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