A TORRENTIAL PRECIPITATION EVENT IN THE EASTERN PART OF ROMANIA A CASE STUDY

摘要

The case study is focused on the flash flood from 5 September 2007, a (235 mm of rain in 12 hours) occurred in the city of Tecuci (eastern Romania), causing fatalities and numerous properties damage. It was generated by a back-building mesoscale convective system developed in an area with strong warm advection at low levels and diffluent southerly flow at upper levels. Analyses of conventional weather station, radar and high resolution visible satellite imagery, together with ALADIN model analysis, are used to describe the synoptic and mesoscale weather patterns associated with the flash flood. Surface analysis and high resolution visible satellite imagery identified a convergence line that acted to focus thunderstorm development in a limited area. Radar reflectivity indicated that rapid cell generation occurred where the convergent line existed, just north of Tecuci. A strong southerly low level jet focused the most active convection over the same area during several hours. The aim of this paper is to identify the different mesoscale processes leading to continuous regeneration of convection in the same area that contributes to the heavy rain accumulation in a short period of time in the small watershed located in the eastern part of Romania.