Petio Simeonov, Petar Konstantinov, Petko Boev and Rangel Petrov

A brief overview of the activities is starting with academi- cian Krastanov’s fundamental cloud-microphysics studies as well some well-known referred studies outlining the development of weather modification (WM) activities in Bulgaria especially about the contribution of laboratory research on the nucleation activity of new compositions for cloud seeding.