The 1st MTGV Workshop on Rainfall Products Validation and Hydrological Applications in the Tropics, organized by the Megha-Tropiques Science team was hosted in the Observatoire Midi-Pyrénées in Toulouse, from 25th to 27th september. 5 keynote talks and 6 sessions covered various aspect of rainfall uncertainties : sources of uncertainties in instant retrievals, scale issues, error models for satellite and ground ‘truth’ estimates, hydrological applications and cross-validations. Participants from 15 countries (Brasil, Burkina Faso, Cameroun, China, Colombia, France, Germany, India, Italy, Ivory Coast, Niger, Peru, U.S.A., U.K., Venezuela) representing the rainfall experts and users community were present and contributed to the rich interactive discussions. The program and presentations are available here.