These are the published weather modification attempts, from http://noaa.gov. According to US Code Title 15 Section 9a:
The Secretary shall maintain a record of weather modification activities, including attempts, which take place in the United States and shall publish summaries thereof from time to time as he determines.
https://library.noaa.gov/Collections/Digital-Collections/Weather-Modification-Project-Reports
https://library.noaa.gov/weather-climate/weather-modification-project-reports
