Seasonal analysis of MCS that generated severe events on Rio Grande do Sul from 2004 to 2008

Cláudia Rejane Jacondino de Campos, Gustavo Rasera


In this study were analyzed Mesoscale Convective Systems that reached Rio Grande do Sul state (RS), Brazil, and generated severe events (MCSRS-SE), as well as the Severe Events related to them (SEMCSRS), from 2004 to 2008. For this study, different data sources were used: maximum size, lifetime and trajectories of MCS that reached RS (MCSRS) based on Forecasting and Tracking of Active Cloud Clusters (ForTrACC) analysis tool; raw infra-red (channel 4) satellite imagery from GOES (Geostationary Operational Environmental Satellite) 10 and 12 satellites and Severe Events (SE) reports obtained from RS Civil Defense data base. The results showed that: i) 10.7% of MCSRS generated 45% of SE; ii) MCSRS-SE were more frequent in JAS (Jul, Aug, Sep); iii) JAS e OND (Oct, Nov, Dec) presented the largest number of SEMCSRS; iv) there was a direct relationship between size and lifetime of MCSRSSE; v) the smallest size and duration of MCSRS-SE was detected in JFM (Jan, Feb, Mar); vi) the longest MCSRS-SE were observed in AMJ (Apr, May, Jun) while the largest in JAS; vii) MCSRSSE preferred mean trajectory, in all quarters, were predominantly zonal, from west to east.


Remote sensing. ForTrACC. MCS. Severe events.


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