To project the future of rainfall, global climate models are not enough, as they operate on too coarse a scale. This continuity, which began in 1905 at stations like Gamboa and Alhajuela, allows for the detection of climate trends with high statistical certainty, without resorting to speculation. The results are clear and, for those who wish to see them, concerning. Every millimeter of rain that fails to fall means less water in homes, less water for productive activities, reduced transit capacity, and more tension between different uses, as well as increasingly complex operational decisions. What is novel—and noteworthy—about the study is not only its diagnosis but also how it was reached. Ignoring these signals now would be a decision without technical basis. In an era where opinions abound and rigor is scarce, it is reassuring to know that our universities are producing world-class knowledge, with cutting-edge technology and direct relevance to national development. This is where cutting-edge technology comes into play: an integrated climate intelligence system. A study developed by students of the Master's in Water Resources at the Technological University of Panama (UTP), with the support of SENACYT and in collaboration with the Spanish company The Weather Partner (TWP), confirms with robust data what many already intuited: it is raining less, and it is not a fleeting perception. The document “Rainfall in the Panama Canal watershed: projections to 2050” is based on something exceptional on an international scale: over 120 years of continuous rainfall records, with information every 15 minutes, from a network of 56 pluviographic stations operated by the Panama Canal Authority (ACP). Our researchers are aware that this work is only a first approximation and that it would be important to go further and deepen with other models, other climate trajectories (SSP), and a horizon extending to 2100. Another aspect, less visible but fundamental, should be emphasized: human talent. This study does not aim to alarm but to place solid evidence on the table so that Panama can proactively plan its water security, its infrastructure, and the operation of its main strategic asset. For decades, we have repeated that Panama is a privileged country for its abundance of water. However, the most recent scientific evidence forces us to qualify—and in time—this comfortable narrative. The sky is speaking; science has already translated it into data. It is not an isolated dry year but a persistent signal that is already altering the water balance of the system. Why does this matter? This work was carried out by young Panamanian professionals, master's students, mainly funded by SENACYT, which bet on forming local capacities in strategic areas for the country. The alliance with The Weather Partner, a company specialized in advanced climate analysis and numerical modeling, demonstrates that cooperation between academia, the private sector, and public institutions is not only possible but also highly effective. Science does not make decisions; it informs them. The team applied dynamic downscaling with the WRF model, refining the climate information to an unprecedented resolution in Panama: 3 km × 3 km cells. This allows one to “see” how local topography—mountains, valleys, and sub-basins—modulates precipitation. This process is intensive in big data, data science, and artificial intelligence and demanded the prolonged use of supercomputers, with thousands of hours of computation. The methodology follows international standards and had the methodological guidance of the Max Planck Institute in Germany, a world reference in climate modeling, particularly in the rigorous use of physical and statistical models for climate change analysis. The projections to 2050, under a high-emissions scenario (SSP3-7.0), indicate that the downward trend would persist, with an average reduction close to 10% in annual precipitation compared to current levels. In critical stations for lake recharge—such as Agua Clara—the reduction reaches values on the order of hundreds of millimeters per decade. For now, there are no alternative sources. The resulting map is not uniform: some areas of the basin show steeper declines than others, key information for prioritizing investments and adjusting operational rules with geographical precision. Since approximately 1995, annual precipitation in the Canal basin has shown a sustained downward trend.
