On November 13, 1946, snow caused by chemicals “seeded” in clouds over upstate New York fell near Mount Greylock, Massachusetts. Dry ice was dumped into the clouds from an aircraft.Since then, governments around the world have used cloud seeding for both military and civilian purposes. From 1967 until 1972, the United States military conducted Operation Popeye, which seeded clouds in Vietnam with silver iodide. This had the effect of extending the monsoon season by a month, making supply trails in North Vietnam muddy and difficult to travel. After the Chernobyl nuclear disaster, Soviet military pilots seeded clouds to cause rain over Belarus, which would remove radioactive particles from clouds heading toward Moscow. Austria uses cloud seeding to prevent hail formation during rainstorms. In China and Australia, cloud seeding is used to increase rainfall in areas experiencing drought.
Term Part of Speech Definition Encyclopedic Entry civilian Noun
person who is not in the military.
visible mass of tiny water droplets or ice crystals in Earth's atmosphere.
Encyclopedic Entry: cloud cloud seeding Noun
process of adding chemical material to clouds in order to make it rain or otherwise control precipitation.
period of greatly reduced precipitation.
Encyclopedic Entry: drought dry ice Noun
frozen form of carbon dioxide.
system or order of a nation, state, or other political unit.
seasonal change in the direction of the prevailing winds of a region. Monsoon usually refers to the winds of the Indian Ocean and South Asia, which often bring heavy rains.
Encyclopedic Entry: monsoon radioactive Adjective
having unstable atomic nuclei and emitting subatomic particles and radiation.
Encyclopedic Entry: rain snow Noun
precipitation made of ice crystals.
movement from one place to another.