This new focus allows detailed examination of the cloud microphysical response to AgI seeding in a region above the planetary boundary layer (PBL) that is accessible by the cloud-physics research aircraft and in turn provides a data set to evaluate and improve the numerical model’s ability to capture key details of ice and precipitation development in the studied clouds. However, unlike ASCII, which used only ground-based seeding, SNOWIE focuses a significant effort investigating cases of airborne seeding. SNOWIE uses similar observational and modeling tools as ASCII. SNOWIE will be conducted in the Payette Mountains in Idaho and partners with Idaho Power Company (IPC) who maintains an operational seeding program in the region. ![]() The core scientific objectives build on results of recent investigations of orographic clouds by the NSF-funded 2012-13 AgI Seeding Cloud Impact Investigation (ASCII) field program in Wyoming (Geerts et al. ![]() The overarching goal of SNOWIE (Seeded and Natural Orographic Wintertime Clouds: The Idaho Experiment) is to understand the natural dynamical and microphysical processes by which precipitation forms and evolves within orographic winter storms and to determine the physical processes by which cloud seeding with silver iodide (AgI), either from ground generators or aircraft, impacts the amount and spatial distribution of snow falling across a river basin.
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