Blending Precipitation Records and SEAS5 Forecasts for SPI12-Based Drought Prediction in the Lima River Basin

This dataset contains the monthly precipitation series, observed SPI12 values, blended SPI12 forecasts, and forecast verification outputs used to assess meteorological drought in the Portuguese section of the Lima River Basin. It includes the observed SPI12 reference series, hybrid blending configurations for 11 obs + 1 fcst, 10 obs + 2 fcst, 9 obs + 3 fcst, and 6 obs + 6 fcst, as well as supporting error and categorical verification files. The data were used to evaluate the skill of ECMWF SEAS5 seasonal forecasts within a 12-month SPI framework for drought monitoring and early warning. Summary: A set of monthly precipitation, SPI12 observation, SPI12 forecast, blending configuration, and forecast verification files for drought assessment in the Lima River Basin using SEAS5 seasonal forecasts.