On November 13, 1946 pilot Curtis Talbot, working for the General Electric Research Laboratory, climbed to an altitude of 14,000 feet about 30 miles east of Schenectady, New York. Talbot, along with scientist Dr. Vincent J. Schaefer, released three pounds of dry ice (frozen carbon dioxide) into the clouds. As they turned south, Dr. Schaefer noted, “I looked toward the rear and was thrilled to see long streamers of snow falling from the base of the cloud through which we had just passed. I shouted to Curt to swing around, and as we did so we passed through a mass of glistening snow crystals! Needless to say, we were quite excited.” They had created the world’s first human-made snowstorm.
https://www.smithsonianmag.com/history/weather-control-as-a-cold-war-weapon-1777409/