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ANÁLISE DE UM SISTEMA CONVECTIVO NO SUL DO BRASIL UTILIZANDO ÍNDICES DE INSTABILIDADE

2016; UNIVERSIDADE FEDERAL DE SANTA MARIA; Volume: 38; Issue: 1 Linguagem: Inglês

10.5902/2179460x14853

ISSN

2179-460X

Autores

Luciana Cardoso Neta, Morgana Vaz da Silva,

Tópico(s)

Environmental and biological studies

Resumo

The aim this study was to analyze the behavior a Mesoscale Convective System that occurred in southern South America on 20 and 21 October 2007. Observed that this system was due to the combined Subtropical Jet, advection heat and moisture at low levels. Such a system caused hail damage on October 20, 2007 in the following cities of Rio Grande do Sul State: Cândido Godoi, Ijui, Santo Cristo, Passo Fundo, Itaqui, Santa Rosa, São Sebastião Missões and 3 Maio. Were used Satellite images, WRF model and some indices atmospheric instability as K, TT and Lapse Rate. The index K values obtained between 10⁰C and 30⁰C, indicating no intense convection, according critical values in the existing literature. The TT index, with values between 45 and 51 ⁰C indicated favorable conditions for convection, with also slightly different values in the stages of formation and maturation. The Lapse Rate Index showed values between 16 and 20 ⁰C / km in both the formation and maturation of systems due to instability.

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