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The Tropical Wind, Energy Conversion, and Reference Level Experiment, or TWERLE, was sponsored by the Goddard Space Flight Center (NASA) and designed and implemented by NCAR and the University of Wisconsin. TWERLE was an intensive program of meteorological observations made from superpressure balloons orbiting the earth at the 150mb density level. The balloons were tracked and monitored by the Nimbus-6 satellite, providing data which increased understanding of atmospheric circulation. / Crew members at three sites in the tropic (Pago Pago in the South Pacific, Ascension Island in the Atlantic, and Ghana in West Africa) each launched about 100 balloons during the summer and early fall of 1975. The launch crews consisted of about five to seven NCAR staffers. A subsequent midlatitude phase, during which balloons were launched from Christchurch, took place from November 1975 to February 1976. / The TWERLE Records include correspondence, budget information, data, reports, publications, and photographs. Files shed light on the design and logistics of the experiment. Selections from this collection are available online.

The collection includes records related to NCAR's Atmospheric Technology Division's facilities, projects, and field experiments as well as correspondence, project status reports, administrative records, strategic planning documents, and informational bulletins. / Selections from this collection are available online in the NCAR Library's digital repository, OpenSky.

The Cooperative Program for Operational Meteorology, Education and Training (COMET) Records document the work the COMET staff between the years 1989 and 2006. The collection consists mostly of education and training materials such as course notebooks and audio-visual materials. Also included are administrative files, proposals, annual reports, correspondence, promotional materials and recorded storm footage.

CCOPE was a major field research experiment to study the processes that create convective clouds, rain, hail and high winds over the High Plains of the United States. The CCOPE Records document the logistics and scientific fieldwork of gathering data and studying storms from conception to completion. The collection contains administrative papers, reports, research, daily logs, and papers compiled by Dr. Patrick Squires, Director Convective Storm Division. The materials are entirely in paper format. CCOPE was sponsored primarily by NCAR's Convective Storms Division and the U.S. Department of the Interior's Bureau of Reclamation.