Over the past 50 years water managers in California and Nevada have been cloud seeding in an attempt to modify weather and squeeze more snow out of winter storms. The program has an annual budget of 3 to 5 million dollars and is believed to boost runoff by as much as 4%. For more on this story we turn to NPR’s All Things Considered.
What is cloud seeding?
“Cloud seeding, a form of intentional weather modification, is the attempt to change the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practiced in airports.” – wikipedia.org