What is "weather modification"?
Any activity performed with the intention of producing artificial changes in the composition, behavior, or dynamics of the atmosphere. See 15 Code of Federal Regulations § 908) for what is considered weather modification.
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What role does NOAA play in weather modification?
Companies ....that intend to engage in weather modification activities ......within the United States are required by the Weather Modification Act of 1976 (15 Code of Federal Regulations § 908) to provide a report to the Administrator of NOAA at least 10 days prior to undertaking the activity. Those reports are filed via the email address weather.modification@noaa.gov and may be found at the the bottom of this page.
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Activities subject to reporting:

Click the link and get full details ..
https://library.noaa.gov/weather-climate/weather-modification-project-reports