Estudo dos efeitos de parâmetros meteorológicos nas estruturas elétricas de uma linha de instabilidade e de um complexo convectivo de mesoescala na região Sudeste do Brasil

Abstract

This study had as main objective to analyze a Squall Lines (SL) and a Mesoscale Convective Complex (MCC) and the weather conditions that conducted to its formation, development and generation of lightning. These systems occurred between 17 and 19 October 2007, in Southeastern Brazil. The analysis of the case studies was done in four periods: pre-initiation, occurrence of SL, transition period and occurrence of MCC. To obtain the results, the database consisted of data lightning and simulated data, obtained using the WRF model. The simulations with the WRF model were made with three nested grids with horizontal resolutions of 36, 12 and 4 km, which allowed extracting the meteorological fields to large-scale, mesoscale and microscale, respectively, and an evaluation and analysis of some meteorological parameters. The lightning data were obtained by RINDAT (Rede Integrada Nacional de Detecção de Descargas Atmosféricas), which were superimposed on satellite images and meteorological fields. Among the results, it was observed that the region where the systems were formed and developed was favorable to the occurrence of storms, with high humidity, confluence of winds, instability indices with values that attested to the potential development of storms. The large-scale conditions for the occurrence of SL and MCC showed differences and similarities, but in both cases the maximum electrical activity was associated with more favorable period for the development of intense updrafts.