Ambiente atmosférico associado ao tornado ocorrido na cidade de Indaiatuba/SP no dia 24 de maio de 2005

Abstract

In the afternoon of May 24, 2005, a city of Indaiatuba / SP was hit by an intense tornado (category EF3) that caused many damages to a society and economy of the municipality. The main objective of this work is to discern how atmospheric conditions, large scale and mesoscale, in which a supercellular storm that generated this tornado developed. The data were applied the GOES-12 geostationary satellite, WRF(WRF) model and cloud-to-ground lightning detected by Rede Integrada de Detecção de Descargas Atmosféricas. The WRF model was processed with two nested domains (36km and 12km), using input data from different models (GFS and FNL), both with horizontal resolution of 1 ° and updated every 6 hours. The tornado occurred in the warm sector of a frontal system located in the southern region of Brazil, where advections of heat and humidity were highlighted by the existence of a low level jet. The temporal variations in the city of Indaiatuba of the convective indexes and the meteorological variables show that the atmosphere presented all the characteristics indicative of severe weather, with the exception of the storm relative helicity and the helicity energy index, which presented lower values than indicated in literature. A comparative analysis between the values of the convective indexes and meteorological variables obtained using the WRF model with GFS and FNL input data showed trends of 2% (in average) in the values.