CARDS Data for GCOS Upper-Air Network (GUAN) Stations
(Readme file last updated by Imke Durre on December 12, 2001)

Period of record: late 1940s through July 2001

Update frequency: periodically

Quality control: Complex Quality-Control program

Files: one file per station (150 files)

Data format: TD63 format with a carriage return after each header 
and data record and no limit on the number of levels per sounding record

A list of known problems in the CARDS dataset is provided on the NCDC 
website at http://www.ncdc.noaa.gov/cards/cards/cards_data_problems.html.