Global Upper Air CARDS TDF-56

Global Upper Air CARDS TDF-56 is historical digital data set DSI-6311, archived at the National Climatic Data Center (NCDC). This is meteorological upper air data. Data is global for the period 1946-75, although the period of record varies greatly by station. DSI-6311 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-6311 itself was not quality controlled at the NCDC. Most users should not request DSI-6311, 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 It has been superseded by the Integrated Global Radiosonde Archive (IGRA) (C00616).