Formation and Structure of '4·20' Warm Sector Squall Line in Guangxi Province

ZHAI Liping;NONG Mengsong;LAI Zhenquan;QI Liyan;LIU Risheng

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Plateau Meteorology
Plateau Meteorology ›› 2018, Vol. 37 ›› Issue (2) : 568-576. DOI: 10.7522/j.issn.1000-0534.2017.00058

Formation and Structure of '4·20' Warm Sector Squall Line in Guangxi Province

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Abstract

A warm area squall line occurred in Guangxi province on 20 April 2016, bringing strong wind and heavy rainfall. For insight into the formation mechanism of the warm sector squall line, the environmental conditions, formation and structure of the squall line were further analyzed by using varieties of observation data. The results showed that the stranded cold temperature trough ahead of upper trough was beneficial to strongly convective instability. Meanwhile, the lower strong warm and moist air advection played a leading role in establishing static instability. The diagram of T-lnP indicated that the environmental conditions of the southern part of Guangxi were more conducive to the development and organizational reinforcement of convection than that of the northern part. In addition, the cold pool outflow interacting with lower environmental wind field was the main mechanism for the squall line to develop and maintain. The squall line moved and developed toward the one hour katallobaric center ahead. Moreover, the squall line was given priority to dispersive transmission, along with a guiding streamline and the trailing stratiform cloud area.

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Lower warm advection / variable pressure an / the structure of a q / storm of transmissio

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ZHAI Liping , NONG Mengsong , LAI Zhenquan , QI Liyan , LIU Risheng. Formation and Structure of '4·20' Warm Sector Squall Line in Guangxi Province. Plateau Meteorology. 2018, 37(2): 568-576 https://doi.org/10.7522/j.issn.1000-0534.2017.00058

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