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Series 6 contains Dr. Vonnegut's general interest and research files, as well as the inventions that he worked on throughout his career. Topics include: lightning, ball lightning, lightning strikes and the effect on aircraft, volcanic activity and storms on Mt. St. Helens and Surtsey, thunderstorm electrification, and weather-related instruments.

This series consists primarily of tornado observations and eyewitness accounts solicited from the general public via newspaper advertisements in areas where tornadoes and severe storms frequently occur. They are filed using the original labeling system employed by Dr. Vonnegut, where the date and place of the observation as well as a brief statement on the phenomena is used to identify the observation. Accounts of severe storms found in multiple publications, biblical references, and other historical observations are also present.

Series 7 consists of Dr. Vonnegut's published and unpublished articles, letters to the editor, papers, reviews, reports, and book/encyclopedia chapters. Many files contain the research and data discussed within the work, as well as correspondence with the editor(s) of publications where work was submitted.

This series documents the Project Cirrus program, a weather modification initiative undertaken by GE along with the United States Signal Corps, Office of Naval Research, and the United States Air Force, with general oversight handled by the Department of Defense. As part of the effort, Dr. Vonnegut discovered that AgI, Silver Iodide, was a superior nucleation agent. This discovery significantly influenced the science of artificial precipitation and this method came to be adopted as the chief means of "rain making".