Flash flood events which are developed from convective system on territory of Croatia in the period from 2012 to 2022 were analyzed. By reviewing the bulletins of the Croatian Meteorological and Hydrological Service and records in the media about the events of heavy precipitation, cases of flash floods were isolated, after which an additional analysis of thunderstorm activity was carried out. Out of those a total of 97 cases were selected. The goal of the research was to conduct a spatial and temporal distribution of events and to describe the synoptic and mesoscale conditions that favor the occurrence of flash floods. As one of the increasingly frequent and intense weather disasters, flash floods cause considerable material damage and sometimes human casualties. Due to the combination of meteorological and hydrological conditions that cause flash floods, their forecasting is extremely challenging. In this paper, the emphasis is on meteorological conditions, i.e. on searching for ingredients that are necessary for the occurrence of convection, and then the heavy precipitation which occurs from convective systems and causes flash floods. Flash flood events are mostly represented in the coastal part of Croatia, but every year at least one event is recorded in the continental part. The largest number of cases occurs in the summer and autumn seasons, and in the afternoon and during the night when the convective activity is most pronounced. After analysis of upper-level synoptic charts at the 500 hPa level, the southwesterly flow regime is most often represented. For mesoscale analysis, thermodynamic and kinematic parameters were calculated from selected radiosonde measurements that were representative for 87 cases. It was found that flash floods occur in conditions of medium CAPE, but with high relative humidity and precipitable water through the deep atmospheric layer and weak to moderate vertical wind shear.