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.
civilian
Noun

person who is not in the military.

Noun

visible mass of tiny water droplets or ice crystals in Earth's atmosphere.

cloud seeding
Noun

process of adding chemical material to clouds in order to make it rain or otherwise control precipitation.

Noun

period of greatly reduced precipitation.

dry ice
Noun

frozen form of carbon dioxide.

government
Noun

system or order of a nation, state, or other political unit.

military
Noun

armed forces.

Noun

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.

radioactive
Adjective

having unstable atomic nuclei and emitting subatomic particles and radiation.

Noun

liquid precipitation.

snow
Noun

precipitation made of ice crystals.

travel
Noun

movement from one place to another.

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