ANALYSIS OF A CONVECTIVE SYSTEM IN SOUTHERN BRAZIL USING INDICES OF INSTABILITY

Luciana Cardoso Neta, Morgana Vaz da Silva

Abstract


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.

Keywords


sistema convectivo mesoescala, índice de instabilidade



DOI: http://dx.doi.org/10.5902/2179460X14853

Refbacks

  • There are currently no refbacks.


Copyright (c)



Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.