@@ 1. Introduction Deep convection belongs to one of the most intensive atmospheric processes on earth. Deep convection is often associated with heavy rainfalls, wind gusts, hail and lightning. In some cases, strongly depending on favourable meteorological key parameters, the development of tornados is possible (DOSWELL 2001). These natural hazards can result in high damages, insurance costs and sometimes loss of human lives. Convective processes occur on the local- and mesoscale, and are highly variable in space and time in their occurrence and intensity. For this reason forecasting of convection in detail is difficult. Especially the areas of formation, the tracks of single convective cells and their behaviour are not predictable. Rain gauge networks are also not able to detect convective precipitation in its totality and therefore a high resolution long-term climatology of deep convection does not exist. Regarding these problems there was a motivation to find out how convective cells occur and trace over complex terrain. e.g. low mountain ranges. There are some examinations about the influence of mountainous areas on convection done in the USA. On the one hand the aim was to identify regions, which initiate convection depending on different stream directions (BANTA and SCHAAF 1987) and on the other hand the suggestion was to investigate the influence of the Colorado Rocky Mountain Range on the diumal cycle of convective precipitation for two summer seasons (KARR and WOOTEN 1976).
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