First results are presented from an experiment to sound the atmosphere's temperature and moisture distribution from a geostationary satellite. Sounding inferences in clear and partially cloudy conditions have the anticipated accuracy and horizontal and vertical resolutions. Most important is the preliminary indication that small but significant temporal variations of atmospheric temperature and moisture can be observed by the geostationary satellite sounder. Quantitative assessment of the accuracy and meteorological utility of this new sounding capability must await the accumulation of results over the coming months.

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1 National Earth Satellite Service (NOAA), 1225 W. Dayton St., Madison, Wis. 53706.

2 Space Science and Engineering Center, University of Wisconsin, 1225 W. Dayton St., Madison, Wis. 53706.