North American Interstate Weather Modification Council
The North American Interstate Weather Modification Council (NAIWMC) is "a non-profit, tax-exempt organization of regulatory agencies, sponsoring organizations, and research institutions involved in atmospheric water resource management technology, commonly known as weather modification or cloud seeding. The NAIWMC exists to facilitate the free exchange of information regarding cloud seeding research and operations in North America,"] its website states. 
Weather Modification Programs
The NAIWMC homepage displays a map of "Weather Modification Programs in Western U.S. & Canada in 2005". There are interactive links for each state/province's programs.
See Current Members.
The Council first met on March 18, 1998, and has met at least once annually since. Meeting minutes can be accessed here.
Email: dlangerud AT state.nd.us