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Dropping sand into clouds to modify weather
Prof. Emory Leon Chaffee at Harvard University dispensed charged sand from an airplane during 1924, to attempt to modify weather. -
Dropping dry ice into clouds
W. Veraart in 1930 dropped dry ice into clouds, in an attempt to modify weather. His technique and results were apparently published only in his book, which was in the Dutch language. -
Spraying hygroscopic solutions into fog
Prof. Henry G. Houghton of MIT sprayed hygroscopic solutions into fogs in 1938 to dissipate the fog. -
Discovery of use of silver iodide
Dr. Bernard Vonnegut discovered that microscopic crystals of silver iodide (AgI) nucleate water vapor to form ice crystals -
Project Cumulus begins
Operation Cumulus was a project of the UK government in the 1950s which was investigating weather manipulation, in particular through cloud seeding experiments. The project was operational between 1949 and 1952. -
G.E. stops enforcing weather patents
General Electric Company announced that it would no longer enforce its patents on weather modification methods. -
Project Stormfury begins
Project Stormfury was an attempt to weaken tropical cyclones by flying aircraft into them and seeding with silver iodide. The project was run by the United States Government from 1962 to 1983. -
Environmental Modification Convention held
A treaty is signed banning all hostile use of weather modification -
China attempts to control weather for Olympics
China attempted to control the weather to keep rain away from the opening and closing ceremony of the 2008 Olympic games and to use rain to wash the city's polution out of the air. -
Texas Weather Modifications seeds clouds over Texas
In an attempt to reduce the effects of the worst drought in half a century, the Texas Weather Modification Assosiation has been seeding clouds of Texas.
