The high resolution numerical model WRF is used to simulate the hail weather occurring over Jiangsu and Anhui provinces on 28 April 2015 under the background of cold vortex.Combined with simulation data and observation data such as surface dense automatic station and Doppler weather radar， the evolution characteristics of the convective system structure and the possible mechanism affecting its organization and development are studied.The results show that the development， propagating and organization of the convective system causing hails is associated with the mesoscale gravity wave， which is triggered during the development of initial convection near the mesoscale low pressure.Then gravity waves motivate and organize a row of wavelike convective stormss during propagating in the conditional instability and strong vertical wind shear environment.The dynamic structure of the convective storms train is highly organized with updraft and downdraft flows arranged alternately.Each storm is accompanied by strong updraft， and the downdraft behind the storm reaches the ground and form a secondary circulation on both sides of the front and back of the low level of the storm， then the belt of wavelike convective storms are well-organized.Convective storms and gravity wave promote and develop mutually by means of wave-CISK mechanism， thus lead to the sequence of hail occurring in the north of Jiangsu and Anhui provinces.With the further development of stratification instability， the propagation environment of gravity wave is no longer suitable， and the development of convective storm train is unbalanced.The storm cell at the front of the wave train is strengthened， while the storm at the back is weakened， and the wavelike structure is gradually changed.
Haiying WU
,
Mingjian ZENG
,
Yifang JIANG
,
Haixia MEI
,
Bing ZHANG
. Simulation Analysis of Evolution Characteristics of the Convective System during a Hail Storm Course[J]. Plateau Meteorology, 2021
, 40(3)
: 569
-579
.
DOI: 10.7522/j.issn.1000-0534.2020.00016
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