1. Short title This Act may be cited as the Improving Atmospheric River Forecasts Act . 2. Subseasonal to seasonal forecasting pilot projects (a) Improving subseasonal and seasonal forecasts Subsection (h) of section 1762 of the Food Security Act of 1985 ( 15 U.S.C. 8521 ) is amended to read as follows: (h) Subseasonal to seasonal forecasting pilot projects (1) Establishment The Under Secretary shall establish at least one pilot project within the U.S. Weather Research Program of the Oceanic and Atmospheric Research office of the National Oceanic and Atmospheric Administration to support improved subseasonal to seasonal precipitation forecasts for water management in the western United States. (2) Objectives In carrying out this subsection, the Under Secretary shall ensure that a pilot project under paragraph (1) addresses key science challenges to improving forecasts and developing related products described in subsection (c) for water management in the western United States, including the following: (A) Improving model resolution, both horizontal and vertical, to resolve issues associated with mountainous terrain, such as intensity of precipitation and relative fraction of rain versus snow precipitation. (B) Improving fidelity in modeling of— (i) the atmospheric boundary layer in mountainous regions