Abstract: The present paper (a case study) aims at analyzing the synoptic conditions registered between the 18th and the 23rd of September 2005, which led to extremely abundant rainfalls fallen on 12-24 hour intervals and to severe floods in Oltenia, as well as within all the southern regions of the country. The registering of such a situation in the mentioned interval brought to the sixth flood wave in Romania, which had catastrophic consequences. Such synoptic situation usually appears in rainy years in autumn and display an unusual intensity of the precipitation phenomena once in 30-35 years. Rainy years are usually registered in the years characterized by a minimum solar activity. The study also approaches this issue from the point of view of the climatic risk. The results are important for the study of the climatic risk of the increased rainfalls as well as for the forecast activity.