Study of a Mesoscale Convective Complex associated with the coupling between jets in South America

Emily Claudia Pereira Ramos, André Becker Nunes, Luiz Gabriel Cassol Machado

Resumo


It is known as “coupling between jets” when the Upper-Level Jet (ULJ) overlaps the Low-Level Jet (LLJ). The literature shows that such couplings tend to generate or intensify surface instabilities. Thus, the objective of this study is to analyze the synoptic configuration of a Mesoscale Convective Complex (MCC) associated with the coupling between jets that occurred on November 18, 2009. The instabilities reached the south of Brazil, causing intense precipitation and several damages. The present study was carried out through the analysis of meteorological fields using ERA5 reanalysis data and images from the GOES-13 satellite. Upward vertical movements were observed at 500 hPa in the same area of occurrence of the upper-levels diffluent flow, as well as an intense northerly flow at 850 hPa, a large amount of moisture associated with the Northwestern Argentinean Low and the presence of a frontal system between Uruguay and southern Brazil. The coupling was observed on the LLJ exit and on the tropical sector of ULJ. Storm development was observed to the east (downstream) and under the area where the coupling occurred, which was observed before, during and after the meteorological system development. However, the peak of coupling did not occur at the same time of the most intense phase of the system, it occurred in its formation, where values close to orthogonality were observed. As indicated in the literature, there was low-levels warm advection and mid-levels cold advection according to the MCC life cycle.

Palavras-chave


Severe Weather, Low Level Jet, Jet Stream, Diffluent Flow.

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DOI: https://doi.org/10.26848/rbgf.v1.1.p%25p

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