The river plays an important role for industry, cities and agriculture, but climate variability and change have created difficulties in forecasting the available water resources across the basin. Decision makers started to realize that part of the challenge in forecasting at a basin scale was due to problems with reconciling spatial and temporal scales for different types of climatic and hydrological information. When developing integrated climate and hydrological forecasting models for the Neman River Basin, there has been a strong emphasis on data and modelling harmonization.