This bill, titled the "Improving Atmospheric River Forecasts Act," seeks to significantly enhance weather forecasting capabilities, particularly for precipitation and atmospheric rivers across the United States. It mandates the establishment of at least one pilot project within the U.S. Weather Research Program of the National Oceanic and Atmospheric Administration (NOAA) to improve subseasonal to seasonal precipitation forecasts for water management in the western United States. These projects will address critical scientific challenges, including improving model resolution for mountainous terrain, enhancing the fidelity of atmospheric river modeling, and advancing the understanding of their role in precipitation patterns. The legislation authorizes an appropriation of $15,000,000 for each of fiscal years 2026 through 2030 for these pilot projects, which will also engage with higher education institutions and existing NOAA entities. Furthermore, the bill establishes an Atmospheric River Forecast Improvement Program , aiming to reduce loss of life, property, and economic losses by developing accurate, effective, and actionable forecasts and warnings. This program will focus on establishing forecast skill metrics, advancing next-generation coupled modeling systems, and incorporating social, behavioral, and economic sciences into forecasting. The Under Secretary is required to develop a comprehensive plan for this program within 270 days of enactment, detailing research, development, and technology transfer activities, and to submit annual budget proposals to Congress. The program will also explore innovative observations, data assimilation, and modeling techniques, including the use of artificial intelligence and machine learning . Additionally, it mandates improved atmospheric river hazard communication strategies and the acquisition of adequate resources for atmospheric river air reconnaissance observations.