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