During the period of 26 October 1989 through 6 December 1989 a unique complement of measurements was made at the University of Wisconsin—Madison to study the radiative properties of cirrus clouds. Simultaneous observations were obtained from a scanning lidar, two interferometers, a high spectral resolution lidar, geostationary and polar orbiting satellites, radiosonde launches, and a whole-sky imager. This paper describes the experiment, the instruments deployed, and, as an example, the data collected during one day of the experiment.

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*Cooperative Institute for Meteorological Satellite Studies, Madison Wisconsin.

+Space Science and Engineering Center, Madison, Wisconsin.

**Department of Meteorology, University of Wisconsin, Madison, WI 53706

++NOAA/ERL Wave Propagation Laboratory, Boulder, Colorado