USSR Upper Air CARDS is historical digital data set DSI-6325, archived at the National Climatic Data Center (NCDC). This is meteorological upper air data. This is a historical data set of upper air data for the period 1961-90. Data was collected by the former Union of Soviet Socialist Republics (USSR) for the USSR, Afghanistan, and Soviet stations in Antarctica during the last 30 years of the ... USSR's existence. DSI-6325 was included in the larger Comprehensive Aerological Data Set (CARDS) Upper Air data set, DSI-6305, which was quality controlled as it was assembled from many smaller data sets. DSI-6325 itself was not quality controlled at the NCDC. Most users should not request DSI-6325, but should instead opt for DSI-6305. Major parameters in upper air data sets are: pressure, temperature, relative humidity, and wind speed and direction. NCDC maintains this data set in archive but no longer updates nor actively distributes it. It has been superseded by the Integrated Global Radiosonde Archive (IGRA) (C00616).