Netherlands National Upper Air is historical digital data set DSI-6321, 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 Netherlands for 1945-91. It was received from the Royal Netherlands Meteorological Institute in response to a request from the Secretary-General of the World Meteorological ... Organization (WMO). There was 1 reporting station. DSI-6321 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-6321 itself was not quality controlled at the NCDC. Most users should not request DSI-6321, but should instead opt for DSI-6305. Major parameters in upper air data sets are: pressure, temperature, relative humidity, and wind speed and direction.