Heavy rainfall events can result in natural disasters and cause innumerous impacts on society. These consequences can be mitigated by preventive measures applications which are interdisciplinary and integrated areas of study. From the meteorological point of view, preventive measures can be aided by better knowledge of extreme phenomena, the atmospheric patterns related and their monitoring by operational forecasters. The Petropolis city, located in a mountainous region Rio de Janeiro state, Brazil, is prone to heavy rainfall events, leading to the River flooding, and in the extreme events the simultaneously landslides occurrence and loss of life. In that context, this study endeavored to characterize the rainfall and atmospheric parameters which triggered heavy rainfall records and the corresponding Quitandinha River flooding episodes. More specifically, we analyzed events from the time period between January 2013 and December 2014 using observational, reanalysis and radar data. We hope that the overall obtained results could provide quantitative and qualitative aid to the operational forecasters and also the decision makers. We noticed that categorized flooding events mostly related to the South Atlantic Convergence Zone (SACZ) configurations and frontal systems (FS) passage, with a smaller percentage related to local convective storms (CS). The clustering analyses indicated three groups of homogenous precipitation, with higher values over the downstream region progressively decreasing in the upstream direction. The atmospheric parameters showed a pattern of wind change direction in the lower atmospheric levels, a vertical dynamic coupling and moisture availability to support the heavy rainfall development.

暴雨事件可能导致自然灾害，并对社会造成无数影响。这些后果可以通过跨学科和综合性研究领域的预防措施来缓解。从气象学的角度来看，可以通过更好地了解极端现象，相关的大气模式以及由业务预报员进行监测来帮助采取预防措施。坐落在巴西里约热内卢州山区的彼得罗波利斯市容易发生强降雨事件，导致河水泛滥，在极端事件中，同时发生滑坡和人员丧生。在这种情况下，本研究致力于描述引发大量降雨记录和相应的基坦迪尼亚河洪水事件的降雨和大气参数。更具体地说，我们使用观测，重新分析和雷达数据分析了2013年1月至2014年12月这段时间的事件。我们希望获得的总体结果能够为业务预测人员以及决策者提供定量和定性的帮助。我们注意到，分类洪水事件主要与南大西洋收敛带（SACZ）构造和额叶系统（FS）通道有关，而与局部对流风暴（CS）有关的比例较小。聚类分析表明，三组均一的降水，下游区域的较高值沿上游方向逐渐减小。大气参数在较低大气水平显示出风向变化的方向，