Radiosonde Data of North America 4-disk CD-ROM set was produced by the National Climatic Data Center (NCDC) in conjunction with the Forecast Systems Laboratory (FSL) of the Environmental Research Laboratory (ERL), Boulder, Colorado. This product contains all available radiosonde data for North America (US, Canada, Mexico, and Caribbean Islands) through the 100-mb level. Each disk provides a ... different time period: 1946-1965, 1966-1979, 1980-1989, and 1990-1996. The data includes significant, mandatory, and special wind levels for all observation times, and includes geopotential height, temperature, dew point, wind direction, and scalar speed. The user can select output to printer, screen, or file any of the following: a single station or multiple stations for a defined time period, or all stations within a specified geographic region in either synoptic or station sort. The product contains available station metadata, and software is available to access the data for DOS, UNIX and VMS computer systems.