Cloud Seeding

For those of you who thought "cloud seeding" was science fiction, California has actually been refining the practice for more than six decades. As the state experiences its driest year on record, utilities are preparing their seeding systems.
Nov 13, 2013   The Sacramento Bee
Citing street sweeping costs, Moscow's mayor has said the city may start seeding the clouds to reduce snowfall.
Dec 9, 2009   Los Angeles Times
To celebrate the Republic of China's 60th anniversary, a huge party was planned. A huge effort was also undertaken to scientifically make sure no bad weather would spoil the event.
Oct 4, 2009   The New York Times