Cloud Seeding Study

The results of the most scientific study of cloud seeding done to-date were just released in December. University of Wyoming researchers conducted a $14 million randomized blind statistical experiment that was designed and evaluated by the National Center for Atmospheric Research.  The primary laboratory consisted of two parallel mountain ranges, the Sierra Madre and Medicine Bow. During six winters, from 2008 into 2014, the researchers seeded storms that blew over both mountain ranges. They found that seeding clouds with droplets of silver iodide does increase precipitation, boosting levels by 5 to 15 percent. Results of their study can be found at