Abstract
AbstractThe characteristics and influence of the dynamical, thermal, and microphysical processes of a squall line are studied using the WRF model. This squall line occurred in the Yangtze and Huaihe river basins in Anhui Province on 5 July 2013. The active cold pool and the downdraft caused by the rear inflow contribute to the development of the squall line. The cold pool develops strongly, moves ahead of the storm, and then cuts off the supply of the warm air to the updraft, leading to the storm’s demise. Analysis of the microphysics budget shows that snow crystals contribute to the rainfall rate most during the evolution of the squall line. The heating effect is predominant at the high level, whereas cooling plays an important role at the low level. A typical stratified ‘seeder–feeder’ structure of the cloud exists primarily in the convective region of the squall line. The heights of the cloud ice and snow layers decrease continuously with time, and both the seeder and feeder cloud decrease dramatically...
Highlights
A squall line is a linear or quasi-linear convective system consisting of active thunderstorms that bring disastrous weather, such as strong wind, hail, heavy rain, and sometimes even tornadoes
In China, a squall line that occurred over the Yellow and Huaihe river basins on 3 June 2009 brought strong winds, hail, and short-term rainstorms in many provinces; the event resulted in 27 deaths and economic losses of around 2 billion yuan (Zhang, Ding, and Huang 2012)
The aim of this paper is to reveal the characteristics of the squall line’s evolution in East China, as well as explore the mechanisms of influence of the dynamical, thermal, and microphysical processes during its development
Summary
A squall line is a linear or quasi-linear convective system consisting of active thunderstorms that bring disastrous weather, such as strong wind, hail, heavy rain, and sometimes even tornadoes. The influence of severe weather caused by squall lines cannot be ignored. In China, a squall line that occurred over the Yellow and Huaihe river basins on 3 June 2009 brought strong winds (around 29.1 m s−1), hail, and short-term rainstorms in many provinces; the event resulted in 27 deaths and economic losses of around 2 billion yuan (Zhang, Ding, and Huang 2012). Given the severity of the convective weather that they bring, as well as the resulting socioeconomic impacts, research on squall lines is an important topic in meteorology
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