Pioneer Canal and Laramie River by Tony Bergantino
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Wyoming Weather Modification Program: Background

Cloud seeding is the process of releasing silver iodide via ground-based generators or aircraft into the clouds to stimulate the precipitation process.

Courtesy of Colorado Water Conservation Board

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.

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