This has been approved to start in New Mexico: Cloud seeding, often called weather modification, is a scientific process intended to enhance rain and snow, reduce hail damage, and alleviate fog. Current technology dates back to 1946 when scientists working at the General Electric Research Laboratory discovered that silver iodide and dry ice could be used to enhance ice crystal formation in clouds. While silver iodide and dry ice are still used today, research and development efforts over the last 60 years have led to vastly improved understanding of precipitation processes, and greatly enhanced seeding methods. This brochure addresses the most common questions about the technology and provides the interested reader with references for additional information. If you would like to learn more about cloud seeding in North Dakota, please visit the Atmospheric Resource Board’s website at www.swc.nd.gov/ARB/.